Do you think universal frames would be worth while, or is more likely to be a case of starting from scratch? If so, what sort of structure do you think will need fabricating?
(I can't get to see what framework will come with them, so I have no idea what to expect.)
From what I have seen people mount them in two ways (someone might be along with other ideas):
Start from scratch, Use the original BMW sliders and weld in a cross member from the tunnel to the sill in the rear foot well, then mount the rear of the slider and either make some brackets for the front to use the existing points or make new mounting points on the cross member. (although i think this compromises space in the back)
or
Use universal subframes, produce some brackets to go from the bmw seat mounting holes to the narrower universal seat frame. Using some flat steel bar. This is what I plan on doing with my metro seats, ive attached a quick paint diagram in how I intend on doing this. The steel bar would have to be thick enough not to flex however.
Heres a useful link aswell:
http://www.theminiforum.co.uk/forums/topic/63013-seats-that-fit-in-the-classic-mini/page-22
Edited by Grimshaw17, 04 December 2014 - 10:14 AM.