I haven't looked at this thread for a while and expected it to be finished. On the subject of arm mounting, on my DP80 I made a 25mm aluminium sub plinth with an arm mounting pod that bolts to the sub plinth.
I've had limited success posting pics but if you are interested I can email you some to peruse and you can post them if you wish. Main plinth with tt locates on the sub plinth with spikes into dimples in the sub plinth. This keeps the plinth and arm pod in position with no chance of knocking out of line. Jeff Spall of audiomods has a DP80 in an aluminium cnc'd plinth with a heavy arm pod that just sits on the rack/table loose. Not likely to move but if someone else is dusting and knocks you're not to know.
Bakoon 13r Denon DP80 Stax UA-70 Shure Ultra 500 in a Martin Bastin body with jico stylus, project ds2 digital Rullit aero 8 field coils in tqwt speakers
Office system, DIY CSS fullrange speakers with aurum cantus G2 ribbons yulong dac Sony STR6055 receiver Jvc QL-A51 direct drive turntable, Leema sub. JVC Z4S cart is in the house
Garage system another Sony receiver, cassette deck
System components are subject to change without warning and at the discretion of the owner.