You're going to have one awesome machine there Graham!
-Tom
OK I've just completed a 16x sample memory expansion on the SK60 - now I have 64 samples! The hardest part was making up a custom IC socket to fit the larger 16x expansion chip into the old chips PCB holes, once removed. It has a slimline variant of a 256k SRAM chip - same 28 pins, only just very narrow, like a 16 pin small chip width. I got a standard large socket to fit the new 32 pin chip, and on whole side row of pins soldered wires to them and bent them and threaded them through the holes on the PCB. A bit fiddly but works like a charm!
This machine is awesome, even unbent. You should all get one!
I'll make up a guide, of course, and post it up here for you all, with pics.
I've also installed a line-out socket, and also a line in socket, since the SK60 has neither, only a speaker and the inbuilt microphone
Cheers, Graham