Pictures of the servo mountings would be useful. Looking at your pictures on Flickr, I think you have a more advanced model than my own. My own is a Matchmaker and very different to yours in quite a few aspects. Yours seems to be reminiscent of a true Shizuoka CNC unit where as my own is a Matchmaker conversion. I am not too impressed with Matchmaker's workmanship on my machine, although that is no longer an issue as most of it has gone. Luckily my quill lubrication is very visible, so I should have no problems there. Your summit toolchanger is again, radically different to mine, it looks tidier. I have considered losing the ram and replacing it with a stepper and rotary encoder as a substitute for the microswitch and cam system on the top. As you say an Arduino would be good for this type of purpose. I haven't decided whether or not to scrap the geneva mech on the carousel yet, it seems to work quite well on my unit and with a delay programmed into the Arduino code I think it may be OK. Have you had your toolchanger working yet? I had a problem with mine when I first tried to get it to work in maual. I ended up having it in pieces half a dozen time 'till I found the problem. It is quite a neat action that it does and the novelty of it working still amuses me. As for tooling, the Erickson type seems to be reasonably plentyful on Ebay although I have a lot of ISO 40 stuff and may make a new set of claws for it , who knows?