
I've been and spoke to the local Mini specialist who I'll be taking Elliot to for her MOT so that I could discuss the rear valance.
Basically, I wanted to bond the rear valance on in a standard fashion, with the closing plates. He said that wasn't good enough as fiberglass isn't structural enough. The only way he said I could do it is if I cut the closing plates out, stiffened the floor and then bolted the valance on after the MOT.
To be honest, I've been thinking about it and I'm wondering if I should just buy a non genuine rear valance (£9~) and make some closing plates as I intended and fit it properly as standard equipement and then sell the fg valance. It wouldn't make any difference to me really, I was tempted to get a hole saw and do holes in the metal valance to remove weight and aid in stopping the valance being the air brake it is.
Let me know what your opinions are, I'm interested to hear them

Cheers.