I find there is way more time to think about DIY projects than there is to actually do them.
Anyway, stuff on my mind is:
*A wall mounted turntable shelf. Has a second shelf for the preamp. Should be medium weight, steel square tubing and spiked mdf shelves.
*A brass or steel clamping ring which goes around the TT platter to hold the outside edge of the record against the platter. Next best thing to vacuum, which I can't afford.
*Jolida capacitor and resistor mods.
*SDA crossover upgrade.
Lots of other ideas but the ones listed above will take me forever. :)