I do understand what you are all saying about 5" being much lighter than 7.25" but if i'm going to convince my wife at all to join for some rides it will have to be ground level. (also in the future if I ever own property large enough to setup my own track I'm going to want ground level)
I may have found a kit build engine that would meet my needs (i've seen this on a bunch of different youtube videos)
it is basically a 1' x 2' x 18" box on wheels with a little styling. can be assempled without any machining or welding (as I do not curreltly have access to any of that, or any experience with it if i'm being honest) it comes with everything needed to run it, (2x motor assemblies with wheels, suspention, electrionics board, tethered controler, , metal lower frame, even couplers but those are solid and otherwise nonfunctioning) I would just need to supply my own batteries (and possibly the wood for the shell, it is unclear if that comes with the kit)
If i went this route I would want to replace the solid non functioning knuckle couplers with functional ones and add hooks/eyebolts for saftey chains. but that is one thing at a time.
the only downside is this kit is aprox $2000USD plus shipping and that is higher that what I want to spend this early into figuring out if I am truley interested in the hobby.
The Kit in question is the Pine Cove Studios Generic Electric for those wondering.
who knows I may end up changing my mind, but for the time being this is my plan