While they are beautiful when complete, I find building radials to be very frustrating, particularly large scale or anything bigger than 1/48. I'm in the finishing stages of a J2M3 which will have almost none of the engine be visible, considerably less than the A6M.

You're a better man than I. Unless the intent is to open up all the engine panels, I don't bother with that kind of detail. I look forward to what do you with the rest!