How about a potato gun? Mom should love that.
I would get that sled regardless. I drag so much stuff home I have to hide crap in the stickers bushes behind my house so the wife does not nag at me for packing junk home.
Also don't give up on scavenging. Sooner or later your going to score. Check with your city for when they have a free curb side pickup days. Head to those neighborhoods. You will have tillers and mowers coming out your ears. Not to mention weed wackers and what ever else folks toss out. it is a great way to get parts and motors.
Put a ad in CL asking for old motors and mowers.
Hey man whats going on with your go karts you talked about. Perhaps we can help you some on that? What the hold up on your kart?