and the medal for perseverance goes to...
The first time around no one has experience and our work probably had similar misgivings. When I started building chassis (sadly Chris hadn't done any kits then) I discarded three before I got a good one. It can be demoralising. It seems you have got back up and are on track, or you will be soon.
P.s. You could have picked an easier prototype. Mine runs okay but it can't pull anything much. If that motor is heavier than the small coreless ones that could exacerbate the traction problem that results from not having weight over the driving wheels.
No apologies for taking Chris out of context or that horrible pun.