If you are going to cut the dogleg and the sill off then you had better brace your door openings or you are in for a world of hurt. Before you cut any more adjust your door gap and fit. Use a floor jack under the sill to lift the body and open up the top gap if required. Get some 1" by 1" angle iron and WELD a piece from the front A post(hinge area) to the rear B post(latch area) at the top inside the car. This welded on the inside of the door opening will allow the door to swing open for working and closed for fitting your new rockers and should hold your structural integrity. Do one side at a time! Don't remove the left and right sills without some serious bracing. Also you can cross brace from left front A pillar to the right B pillar and vice versa in addition to the door openings.
The rocker panels and the inner sills are a load bearing structural member of the cars unibody.
Cheers and good luck! I'm still available for travel!!!! and I don't drink beer so could be very reasonable!
Dave
WELLWOOD AUTO RESTORATION, INC
wellwoodautorestoration.com