How about doing it the hill billy way, use the lathe and tail stock, as long as you can get something throgh the tail stock that is. Next you will need a long shaft to go through the head stock and tail stock. Make a bearing through which the bar will go fitted to one side of the head stock then bore out the other side, when done reverse and do the other similar to line reaming car king pin bearings using a piloted reamer.
Peter