Welcome! Go to the trusted dealers section here and explore. You won't get ripped off but you will still be broke, only have two wrists and an angry wife - or at least that's my experience
No worries mate, think we all just miss Donerix here. But you can always be sure he's out there travelling the world, hanging with the best women, smoking the best cigars and drinking the best booze.
OMG, this is gonna be one helluva build, nice going with the parts hoarding!! Before completed, be sure to send it over to me for inspection, think that might take some months
He seems to have gotten madly busy last month or so. Got an e-mail from him a couple of days ago though which sheds some hope. I shot him a mail stating "jeks wants a word buddy", so hang in there. If you've gotten yourself into a franken project, patience is the key ingredient of the build
DW roughly equates to David Wong, http://dw-watches.net63.net/wordpress/, not sure if it's safe to order from the site now, were some issues with orders long overdue. For eta7734, you can browse for donor watches at eg ebay, not sure if other movements exists with same specs. Experts can hopefully assist you further
Think it might be a close call. If I'm not mistaken that strap is 115/75 (?) and that should mean you'd be roughly using the last hole. Unfortunately no expert on rubber, so don't know if they come in 110/65 which could be your preferred size...