i am very happy that your are also with tommy.
2. the best lens-shade is a black cardboard on a long swan-neck.
3. i would get that 6x17-multiformat-back from kt163. seagull has a similar one. i dont know the difference. i only remember the kt163-one(It has a different name) has more options.
unfortuntately i will probably not check the fotoman at photokina. i have other plans. but you are right, there are a lot of chunck around. i once had a technar-like self-made camera here from a german friend with the same mamyia-press-mount that tommy 612 has. i have never seen before such a razorsharp MF lens like that old technikon100mm(linhof-lens). but the body had light-leaks....