Hey Ilya, great looking bike! (Ik heb op mf ook al mooie dingen voorbij zien komen van je.)
The forks and calipers in those pictures are from a late 80's, early 90's cbr1000f. They were a fair a bit longer than the cbr900 forks, so should be good for your application. Bearing sizes are the same. I remember i had to grind some of the caliper bracket in order to fit the cbr900 (sc28) wheel and discs, but nothing major.
Thanks cbrx750, good luck with your project, it looks very promising.