so my orig battery had leaked all over the R/R, batt compartment and fuzebox leaving all three about useless. R/R and fuzebox were replaced and batt compartment was cut out and i had to fab up a new one. this is how i did it and its been working pretty well so far... in case anyone else has a similar idea or need.
i suggest poprivets as opposed to bending sheet metal unless you have a sheet metal break. I bent this stainless over a 4x4 piece of angleiron with a sledge, it was a pain in the ass.
the angles were scavanged from my scrap metal pile but i think you get them at home depot in the lumber section. i pop riveted them on, backside to hold the batt in and frontside to mount the coil.
it does however fit in the bike fine
and holds a much larger battery
you will of course have to ensure you get good elec contacts through the box since the bolts that hold it on ground parts of the elec system. also, once its on you may have to figure out where to put everything back in, i had to lengthen some of the wires on the harness to reroute them and drill some more holes to bolt up the fuzebox and other various items.
i've ridden it around a fair amount since doing this and havent had the swingarm hit the bottom yet, even going over speed bumps. i believe it is slightly higher than the original R/R location was.