Okay so I wound up making some bearing drivers out of 1/2" mdf scraps that I had, just stacked them on top of each other to get the right height. Worked a treat! I think one of the bearings has maybe another 1mm of travel so I'll need to do some fine tuning but the bulk of the work is done.
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Things are really coming together. Going to work on making a spray booth out of some oversized boxes and drop sheets and then I'll start priming.