Agree, think the only difference was the width of the cage, but it might also be in the rear. I believe the Lil Bro (I had) was designed for a V6, mine had a V8, so the unfotunate part was only like a 15 gallon tank with the LS3. Also, if you have wide shoulders (like I do even though I'm 5'6") you'll be bumping shoulders n' elbows with the passenger unless they're small.
So .. I'd say go with the bigger models.
My $.02
abc
Great cars, slide well as they have a relatively low center of gravity for a 'long travel' car. I never used the turning brake.. never needed it.. but also it was in the wrong spot.. a tiny handle right inside the left side door/wall. You would have to switch from your shifting hand to the steering wheel, then to the brake.. made no sense.. only used it when I winched her in the toy box. I guess I would have moved it and made a big Ken Block Hoon type deal if I was to use it.
Dudes in the Funcos with those wide paddles slide the sh__ out of them!