Thanks guys! Some great feedback!
The flatmount trem is an all-in-one unit. There are two (used to be) strong springs under the bridge, and a major chunk of wood was hacked away to fit it. There's a picture of how it *used* to look (trying to post a link now...) here. You can see where I've bolted it to the body's top. The pickup there is a Kent Armstrong Motherbucker - two stacked single coils in one unit, one is a PAF+ and the other is a Super Distortion. I've rewired the scratchplate to have single/off/humbucking for each pickup ;-) The back of the guitar is smooth - no routing or cutting has been done at all cos everything is fitted into the front. And yes, I know it's pretty sad to paint such a Godawful colour scheme on such a lovely piece of wood! All I've done to it since are strip it bare and cut a big semicircle behind the bridge so it sits on my knee better (think the Steinberger Strat-style guitars).
Anyway, having a cut-down Floyd block sounds like a cool idea, although I have some power tools so sticking some more wood on the back & re-routing etc isn't a scary option either!
Thanks guys, I'm gonna have a think and see what I come up with!
Oh, and by the way, the guitar's a little oddly shaped cos I'm a lefty, but prefer the balance of a righty upside down! LOL
Cheers, Dave