rear frame repair

[pwdcougar]

Posted this on my project/build thread in the 67/72 Suburban forum and though I'd post it again here in hopes that it would get more response. The ends of the K10 frame were cut off and the body mount holes are badly rusted.

The truck is a 70 K10 Suburban and the patch piece is from a C10 Suburban.

Cut the rear frame portion from the 68 today in the pouring rain so I can repair the rear section of the 70.

Any recommendations on welding this on? I was thinking of the following steps:
1) remove the rear shackle mount

2) make wood braces under the existing frame in 3 or 4 locations to orient the frame for alignment. Locations for the braces approximately where the yellow X's are.

3) cut the original frame and replacement frame at the same point.

4) butt weld inside and out

5) use my extra steel to fish plate inside the frame

6) re drill the shackle mount and bolt back into place with grade 8 fasteners.

Any suggestions? Should I post this on the truck section or someplace else?

Thanks

Paul