It is exactly what I plan to have in my private, "exclusive" wooden N900's body - except for fact, that I want only "off-covered/ on-clear", without hot IR filter. It'as due to fact, that I want to design simple mechanism for quick replacement of camera module (no idea, if external hot IR filter would be enough, to make one "universal" camera module, for shotting both normal photos, and IR ones, when using IR pass filter?).

As it's niche of a niche I don't plan to offer body replacement's complicated by additional system (for quick camera module replacement), but as I have to project it anyway, I'll gladly share designs on Free license. Don't hold Your breath, though, as it all have to wait until base design for body replacement get finished.

Of course, considerable donors/pre-order supporters have special rights, any if any of them is reading this thread and interested, no problem on making their units modified for support of IR photo/NightVision filters, and quick camera module replacement (although it, also mean waiting little longer, as "base" units need to be finished first, before I start to create "variations" like this one, mainly for myself ).

/Estel