Definitely a useful idea Alex. Anything to block stray light really helps. I doubt that the hubble telescope uses painted sawdust though.
I have been known to observe with a full hood (a bit like Obi wan!) in the backyard to block more light from hitting my eyes. Works really well, you just have to have a handy light sabre to beat off the laughing wife...
Looks like it is all coming together well derku: and good pick up on the increased contact area for the focuser. I don't think I would flock the focuser (just more bits to float around!), but spraying it matt black wouldn't hurt.
All the best with the mods: in my experience they never end; there is always some improvement to be tried.
- Dean