floor panels & crossmember

["BOLIN, TIMOTHY" <TBOLIN@scana.com>]

i'm finally ready to weld in replacement floor panels in my 65 midget, i
also will be fitting in new sections of the cross member. 
should i :

a. leave the original crossmembers in place while i weld up the panels
then cut them out 

b. cut them out, then weld the panels in followed by the
crossmembers

c. cut the crossmembers out, weld the new sections in then weld up      
    the floor panels

would appreciate any insight 

thanks 
tim