He knows a thing or two about a thing or two 
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Especially when it's a cheap Chinese instrument.
OP appears confident that he's up to the task though.

He knows a thing or two about a thing or two![]()
This looks like fun @JIO
What are you going to do with the headstock?![]()
I thought about buying one of the 8 string basses from China ... I decided to build my own instead
Going that route will most likely be a wash financially - it's something I always weigh out when taking on a project. (parts, finishing, labor, etc) No right or wrong - just different tacts.
a lot of my projects don't make sense but it is fun to do them
You can't negotiate with crooks. They already know what they're doing is shady and they'll just continue until they get caught/shut down,...then open under a new name.
As for the bolt-on neck comments?
Set necks and neck-thrus don't usually have alignment issues. Preferring bolt-ons so that you can adjust the alignment issues that they are prone to, seems like an odd way to look at it, to me.
I worry a little about things becoming possibly too flexible with that very large rout around the neck join - just a thought, but I think I might leave some meat in these red marked areas meself.
View attachment 4800160
But as you and I know, a builder can get it wrong....Set necks and neck-thrus don't usually have alignment issues.
Maybe other builders. I've never been wrong or made a mistake.But as you and I know, a builder can get it wrong...