Make it drive-able is the way to stay motivated, I Love classic cars, I have been busy for 5 years on and Gran Torino and just like you i got demotivated so many time's and don't want to count to no of guys who think who can fix cars but only in there mind. And the car is still not running.
I'm 40 with all finances in place I managed to convince my wife to let me buy my 1972 challenger, made my calculations and had some money extra to give it an paint job and have it road worthy. 10 days for my Challenger to arrive I got into an accident with my daily driver. All the extra money I thought I had went into fixing the daily driver.
Barely managed to get it the challenger driving. was the laugh of the family. He has 2 classic cars in bad shape. I drove it about 1 year like that, leaking radiator, busted exhaust pipe more holes than tubing, leaking carburetor, even used it as an daily driver to help out the parents temporarily with my car. Every time it rained, and we had an rainy rain season, the car would leak into the passenger inside the cabin. More laughs from the family.
It took my one year to save the money and I don't have the skills to fix it up my self, you have the gift, I wish I had.
I finally managed to get to an point that everybody is looking at you when you drive by, and like the say it is an illness you will carry it for the rest of you're life.
So now I'm saving again to either overhaul the challengers engine of to give an try again on the Gran Torino. Hope this helps. Never give up.