Unlockable Bootloader and publicly available kernel source within days of release are the least you would need to do.

Could you get the body of the Xperia Pro, or the Desire Z, and build off that, or is that going to cause legal issues?

Also, have you finalised the specific SoC?, and screen specifications, and by screen specifications I mean not just AMOLED vs LCD and size, but IGZO, Panel Self Refresh, IPS, Quantum dot, that kind of detail.