I do it too... Start to play around with parts, and BOOOM, got the idea, start to build it...
Like this "Fortish Wagon" that I build alost two year ago. I was looking trough the spare parts, and I found a Bburago '62 Ferrari Testarossa body, and a Revell (I think) '39 Wagon Rod body, I was thinking to trash both of them, but... After start to play with them, I mean play like a 1 or 2 year old kid that put together pieces without sense. :lol:
I like it, and I start to build it.
Part of the interior is scratch built, the side of the body too... The engine i don't know from which kit or car it came from, the wheels also are scratch built...
After I add a Christmas tree because I finish it close to Christmas... The tree is removable. And the hood open.