Hello mate, glad it fits, am sure you can pick an elbow fitting for the big one if you ever need to, space is limited a bit now so use your roof and fit ya hose reel upside down to it, ( let me know if a pic needed ) this will free up the floor space,
I would use the space behind tank/ seats to have battery pumps and controllers, and if they fit DI bottles, or a small double DI (£65) would easily fit, so hoses would then come out the far side( if they fit round, maybe another small hole if they don't ) up the ply lined into hose reels, leaving the back of the van empty for the boys.
I haven't finished mine yet and prob never will, it's just a case of making the most with the space you got.
Matt