Happy with my shims and neck fit is snug as! now. (Needs a firm hand to push it into the pocket now, and it seats admirably firmly but still removably).
Going to pick up some 12mm dowel from Bunnings, for the bridge post holes today.
Decision made, I'm definitely going with the roller bridge, and mounting it vertically as opposed to offset.
Still out to lunch regarding using a Moslike trem, or just keeping it simple and going with the stock To'M stop.
Feels good to be on the move again with this project.