The chicken or the egg, the cart before or after the horse, sometimes there is no simple answer that explains every thing to resolution.

 The EVOLVING SNOWMOBILER

 WHO ARE YOU ??
So what kind a person would want to be a part of this grand, cold, unimaginable experiment?
When someone said "SNO-JET" did you end up snowmobiling when you actually thought you were signing up to leave the country on a SNOWBIRD WINTER HOLIDAY? 

 AN OUTDOORSMAN ??
- It would appear that besides the obvious "Outdoorsman" characteristics.
OK Outdoorsman and...fact that you like to fix things that are engineered wholly inadequate, and are engineered for a warm weather climate, but have been adapted for use in sub zero winter temperatures?

 THE MOTORHEAD ??
-You would like to tinker mechanically? I use Tinker with a little sarcasm! LOL
 -Slang Definition: Motorhead
What mechanical dude or motor head  would shell out hard earned cash for a "Winter" recreational enginized snowmobile just to bomb around in the extreme cold and have to spend more time fixing the snowmobiles than actually riding them?
 MOTOR HEAD PROJECT
-Through out the history of the snowmobile, every snowmobile new or old, out of desperation or dogged determination could be defined as a Motor head  project!
-OK this is clearly part of the equation, Through out history whether it is auto racing etc or snowmobiling, there are speed contests and the  "Driver" comes out in individuals. This does not mean you have to be a racer. But it means when there is no rules it can be an all out competition, and it may be for speed, turning ability, deep snow capability, or even fuel economy. As a snowmobiler, experience teaches you to pick your battles!! 
You very well may be a "Mechanical"  MOTORHEAD long before you would be consider yourself a  "Driver"  ...or vise versa. What would  the "Inspiration" be to ride a "Iron horse" ? The cold? The bucking? The freedom?

 THE DRIVER ??

-Lets start with a driver...I think that the urge to drive and operate a motorized oversized go cart on skis and tracks is the challenge at hand.
 MOTOR HEAD PROJECT
-Through out the history of the snowmobile, every snowmobile new or old, out of desperation or dogged determination could be defined as a Motor head  project!

What makes you a "Driver?"

Well to start with, with your car for instance first you enjoy driving. Can we rule out anyone who gets car sickness, and has to take gravel every time they get in the air !! LOL !! You may even do it as a profession or driving may be part of your professional capacity. In any case you anticipate traffic, you know how to "merge" and understand when your vehicle goes into a slightly icy slide in the winter it is no time to lock up the brakes or let go of the steering wheel and cover your eyes!! As a snowmobiler you enjoy the variety of trails, fields & ditch banging variety. Have you discovered that by adjusting the front suspension, or by pulling up the front strap or changing the moment coupling in the rear suspension occurs you can change ski pressure, minute changes that change the feel and overall ride that the snowmobile provides in a given snow condition or train, a change that may or may not compliment the aggressive quality of the skis or track.
Is there a PROJECT at hand?

You adapt to snow conditions and find a faster line across and thru the given terrain and you adapt to these changing conditions quickly.
After a few good rides you notice  that when you turn on a packed trail that the sled does not actually go where the skis are pointed....in stock car terms, the sled pushes....like a dump truck or a heavy North American automobile built largely thru into the 90's it is just about impossible to create a "loose handling" snowmobile. Conventional automobile builders believed that if you "go into the turn" or "traffic circle" a little to fast that you would be better off "with the wheels turned" going straight off the curved section of the road straight into the ditch than get loose and have to slightly counter steer your vehicle slightly and allow it to slow down to regain control...Holy Hanna! does this sound like a good handling snowmobile!
After some Adjustments you find your self putting your sled deeper into the corner, whether a trail bordering a slough or the edge of an aggressive rolling stubble field. You "hang 10"...OK lets stop there...that pertains to water surfing! not snowmobiling! LOL
Is there a PROJECT at hand?

 "Motor Head" and "Driver"

Can you sense your engine is RPM'ing thru and out of its power band leaving cards on the table for another day and another race?
Is there a PROJECT at hand?

And would you like to adjust it by trying different weights in the primary clutch so you can out accelerate your buddies?
Let me guess you run a felt marker up and down your clutches to get a handle on shift out for a given MPH.
Do you carry a felt marker to mark the clutches?
Is there a PROJECT at hand?

Do you have to shove your secondary "in just a bit" in the morning when your sled is idling thru its warm up...to say if you don't shove the secondary in a hair first thing during the longest engine warm up of the day...that "hamstring tight" belt is gonna just start
(RIGHT CLICK) squealing and squealing ....when idling  extensively at warm up, the squealing will give away just how "tightened up" your set up is!!
Is that evidence of a PROJECT ?

Is the belt visibly running all the way up and down the clutches, and indication that your transmission is engaged fully and  utilized to its maximum?
Is there a PROJECT at hand?

Is this evidence you are a MOTORHEAD?