I have also jumped onto the Adeptus Titanicus bandwagon - and much looking forward to getting a game in.
So far, I have assembled five of the fiddly buildings and three fantastic looking Questoris Knights. I have not quite figured out why there is only one of each weapon in a set - ie. an Avenger cannon, a battle cannon and a thermal cannon? Seems an odd layout? That said, I have - besides the GM Edition Box - bought an extra set of Questoris Knights and a pair of Warhound Titans. The latter should be enroute in the mail. Very much looking forward to getting my grubby mitts on them!
Legio-wise, I have not yet decided on colour scheme - but as I have assembled three Questoris Knights and five buildings, I will be painting them first. As for my Knight House, I will probably go with House Tintaroth from the Titan! Comics "Will of Iron", as the colour scheme is 1) wickedly good and 2) different from anything else I have painted during my 26 odd years in this hobby of ours!
So - stay tuned - there will be pictures up this evening of my progress to date!