Seen others but besides race, gender, etc which are mostly asethetic, what birthstone, spells do you recommend. and in reference to the "Plea to Bethesda from long time NEcromancer" or whatever, how do you move corpses in between zones in order to get them in your house?

you could thrall them, fast travel to your "crypt" then kill them.

you can also do it a bit easier with console commands.

when you kill a thrall, do they not turn into ash?

they will not, dead thrall is special in that regards and you can re use bodies as often as you want.

Just make sure if you do fast travel with your Thrall, don't fast travel to the interior of a walled town. This will frequently cause you to lose your Thrall. You're safer to fast travel to the stables. But maybe this is something that will get fixed with 1.4...not holding my breath.