Thanks for the advice guys, much appreciated 8)
@ Smidey: I can't really put a central support if I want to have a sump as well Why should the end panels be extended over the back panel?
@ Skippy: I also can't have anything 610 really, standard MDF is 2400x600 and this stand would use one sheet with almost no waste at all. Timber frame isn't viable also, too much hassle on top of MDF, may aswell just build a timber one.