Absolutely fantastic work so far, I have the exact same frame (Sadly not the forks though) and they ride superbly, and mine has the same combo as yours Alu head lug, Ti tubes, and Cro-mo rear stays. The MT 4 did indeed have 7 Ti tubes, not sure how they ride but the steel rear and supple Ti seems to do the job nicely on these
Keep up the great work, can't wait to see the finished bike