I have a 7x10
Varmit AL's page is a good start, so is little machineshop dot com.
A tip, the 7x10 uses plastic gears. When you change settings, rotate the chuck a little by hand to make sure the foward/reverse and high/low handles are seated. Also don't stall the head while spinning, it trashes the final two gears , breaks a small pin, and you need a new "e" clip on the drive shaft.
If you scrape the ways on the 7 by ten and build the tailstock adkustment mods, they are decent. After scraping the ways and doing the tailstock mods, using a active center, we took mine into the university machine shop and took a pass off a 1/2" brass rod, then stuck it on a granite bed and dial indicator. It held + 0/ -.001 across 6 inches of brass. If you buy a few extra slide parts,and a instrument makers vise, you can make a milling attachment for very small pieces, ie brass, aluminum.
Get a couple of center drills, a decent 1.5" travel dial indicator with base, and one of the modified tool posts. A 1/2" drill chuck with the MT2 or MT3 taper, minus the tang. A good carbide insert tool does wonders. A threading gauge rounds out things. I would not waste my time with a boring bar, the tool post is not that stiff.
If you've used a lathe before and know all this stuff, just ignore me.
But do straighten the ways and polish the gibs, it makes a world of a difference.
Think of a 7x10 as a good start, a kit of parts that is easily improved.
But I would have kept the PPK.
Steve