Installed spindle on milling machine and made first 3600 rpm -> 120Hz motor test run.
few pictures how it looks. I installed and aligned spindle housing with precision 0.01mm on 2 sides, actually I needed alignment on X axis side of rotation, where spindle box rotates, I made spindle box holes 1mm wider in direction of rotation => +0.5mm on each direction for this kind of rotary alignment, and all bolt holes fitted perfectly, had little problem of placing screws in that tight narrow screw cut out.
On Y axis rotation I didn't needed any adjustment it fitted perfectly, I guess I milled spindle box and spindle housing mounting surfaces with close enough tolerance.
only few steps are left, like turning taper surface, and making new drawbar screw with 15.8mm diameter road, I tried to hammer 16mm drawbar screw and it goes in, with hammering, but length is insufficient, and I need screw that goes freely, so i will make new 15.8mm screw.