Not exactly but sort of. What I have done is buy a moderately priced desk chair and then upgrade the cylinder and the wheels to much nicer ones. Makes a world of different.

Messed with my chair a fair bit. In terms of getting value for money, building one would probably not be so great. The parts add up quickly, so you usually won't end up paying less to build than to buy. Best bet is to look for a thrift shop find and maybe upgrade/repair over time.

The most annoying part is how often you go to look for a chair you liked and find out they don't make it anymore.

Thought of it, even an adjustable height desk with air cylinder support. Went with the Staples Hyken chair, and a monoprice electric desk (bring our own top). Happy enough.

Otherwise many chair bases are interchangeable though not-all, Frankenstein chair is possible.

kinda.. had to take off the armrests for my shoulder but the back was connected through them so I ended up using some L shaped parts cut out of furniture to rebuild it.. looked like shit but it worked.

Will be keen to see the tutorial and results of this.

The thrift shop is your friend. You can often find pretty good gently used desk chairs cheap.