Dual ED80 setup

Although I was looking for a blue or gold ED80, I managed to get a virtually new black ED80 for not a lot more, which included a SW field flattener and a few other extras. I sourced a few pieces of 10mm aluminium off a friend and have a selection of dovetails and basic machining tools at my disposal. Ive read through a couple of threads here on this type of thing and am looking pointers on what to look out for. Planning a side by side configuration, with two DSLRs and guiding with

I decided to go with a Geoptik dual saddle that I had spare, instead of making a new rig. I slotted one end of one dovetail for lateral adjustments (ignore other hole as this was already present in the second hand dovetail), and for vertical adjustments I simply filed the base of one ring in several iterations until it was as close as possible. I’ll try it out and see if it’s ‘close’ enough. So its now all sitting balanced and ready to go. Next thing to sort out will be controlling two came