Vilem: Late answer, but - that looks nice! I notice that there are no special problems under the index finger home keys on that Genius SlimStar, which makes it a very moddable board. I see from their site that they have various keyboards including a gaming board - SlimStar 335 BattleCraft - with anti-ghosting (useful for fast typists as well!) and programmable extra keys (useful for most people!) but the same slim keys from the looks of it. I may look out for one of those babies in a Norwegian shop, actually. Looks like you can get several variants including very fancy ones and quite cheap ones, so there should be a Genius board for most tastes as long as slim keys are acceptable (and for us remappers I think there's hardly a way around so we'd better like them!).
I remapped another Fujitsu Siemens board today (a KBPC S2 to be more specific), and it went well apart from the K and N keys which had to lose their attaching hooks because they were in the wrong corners. For a moment I thought I could bend the hooks in under the next row of keys, but then pressing L or U would also press N simultaneously, haha! So scratch that idea. I don't really turn my boards upside down a lot, so as mentioned it's not a real problem.