I'm very interested in outcome of that - especially, that if HtheB really have access to required $$$ tools, it would be possible to change N900's OneNAND to one containing 1GB RAM (quite hard to get exactly same type with more RAM, but still possible) We all know what it means, and where harmattan can hide, then /Estel
Changing /any/ SMD chip has already been discussed since N900 days, especially the eMMC and SoC. tl;dr version of every single discussion on this already: It's possible, but incredibly impractical to do so unless a) You can obtain a single part for cheaps, and b) You have access to $$$$$$ tools to properly do the swap. You'd probably have to be a very bored EE to do this instead of buy something else.