I think that this is a great idea, but one that is basically unworkable to the degree tht you think guys. I know of 3 110 hicap defenders that use the original butt, and the owners of them cant stand the fact that the wheel arches are there. One company has 2 and the 3rd is owned by someone else. It also ruins the lines of the vehicle as it was impossible to build without installing a new subframe for variuous reaons. The most obvious reason that raised its head is the fact that the chassis rails of any vehicle are not flat unlike the underside of the butt, so along the length of the chassis are mounting points creating a level surface on which to mount the bodywork. Another reason that subframes cannot be mounted next to the chassis is that things like spring hangers and shock absorber mounts are welded to the chassis rails, and moving these would mean interfering with the structural integrity of the vehicle, and probably mean entering a whole world of what usd to be SVA requirements. The inside of the chassis usually houses fuel tanks which would have to be moved to accomodate tipping subframes. Furthermore there are strenght issuse with not fitting a whole subframe to the vehicle and thus affecting the lines of the vehicle- in order to tip there need to be hinges at the rear of the tipper unit/ vehicle chassis, and there isnt a chassis out there (short of L/R) that is anywhere near strong enough to take those sort of pressures- i have seen some that are just made of channel on its side at the rear end!!
I cannot see that it is possible in any way to achieve your goals, having built a tipper myself and looked at loads first. I also spoke to the engineer who built 2 of the aforementioned hicaps.
There is obviously a good reason why tippers are made the way they are, and i will be truly amazed if you guys coem anywhere close to succeeding where nigh on 100 years of truck manufacturers havent, with millions of dollars of research to play with, although if you can come up with a solution ticking all your boxes (original appearance, tiny cost etc etc) then i will be one of your first customers:thumbup1:Good luck.