Hello,
Yes, it is RaySkin "samegawa",and I woulbet it is red lacquer.
I confirm you habaki is 2 pieces, and blade must be Tamahagane
I confirm you the blade is the most critical part of restoration and should be restore by a qualified professional.
Please abandon the idea to restore it by ourself, to polish a japonese blade you need specifics stones, technics,...
I unfortunatly saw too much blade restored in "do it by ourself" that are now dead and can't be restored anymore.
hope it can help you :D
sebastien