Seems like every year at CES we see those fancy gaming desk setups and every year they still cost thousands of dollars. If you only have tens of dollars to spend on gaming desks, then get some aluminum pipes like this guy did.
I don’t know if I’d use my actual PC as an ottoman, but you could get creative and build some sort of enclosure for it. And lest you be worried that it’d be impossible to squeeze into that chair, the monitor and keyboard swing outward like all good gaming desks should.
There don’t appear to be any actual plans drawn for this project that you could use to build your own, but the whole rig looks pretty straightforward.