HI Wayne,
It is best to have a FLAT table large enough to hold the basic structure of the model: wing and fuselage together. As you know, an I-Beam builds in "one piece" in that regard. Everything is jigged so everything is straight as long as you can put straight reference lines on the model, and the table is flat!!
The slowest, most nagging job, is cutting the strip ribs, but that can be easily handled in other ways form the way I do it.
I build the fuselage first, shaping the blocks can be done easier before you build the wing into it. Pop off the blocks, tack glue the fuse, upside down to the glass table, and start building the wing! Once you have done it, you will realize that you can build an I-Beam as fast as you want to. It is the quickest method of framing up a complete model I know of.
I actually built I-Beam wings a couple times separate from the body. Didn't really like doing it that way, but what the customer wants, the customer gets!
Merry Christmas!