I did this to get my straight induction pipe in and didn't really fancy the battery in the boot...
I have been asked how I did it..Firstly the battery is slighly smaller than norm..Code 063..I popped down to B&Q and got some mild steel flat bar, 35mmx20mm box, small flat plate sheet, small right angle brackets and threaded bar and some bolts & washers..I extended the intake temp sensor wires and earht lead to battery...Using existing holes as indicated for the battery tray and brackets..This is how it will go, a bottom support bracket is secured and comes up from the gearbox mounting, theres a bolt that sticks straight up and you just pop the bracket over it and do the nut up again and it supports the underside of the tray this end..
You have a second bracket coming down from the side of the suspension turret and bends round the edge of the tray and supports the other end ot the tray..
Your sheet material is cut just larger than the footprint of the battery,also you can use the plastic tray thats on your original battery shelf, cut to size and lay ontop of the metal sheet you have cut, your box material is cut just longer than the length of the battery..Drill holes down through the box material and your new tray to line up with threaded holes where the old air box sat.
Bolt your right angle brackets to the tray either side, your threaded bar will hook into the holes and go up the sides of the battery to secure the battery clamp onto..The battery clamp was made from flat bar and just bent in the vice to the shape of the battery and then I drilled holes in either end..
And it all simply just bolts into place..Yes my version looks abit rough, but it took from idea on a Sunday afternoon to finishing that evening 3hours from start to finish..Just noticed, yes I welded an extra bit of metal in the centre of the box material, not really needed, just had the welder handy and abit of metal...