Frame Complete? Frame Stretcher to add 12-24"?

[Bandit]

After acquiring the great Whirlpool Gas Cooktop from Lowes, I've had to reconsider my Galley to accomodate its size and still maintaining a comfortable length for sleeping.
Does anyone have one of those elusive Frame Stretchers so that I can add 12 - 24" to the length? If not, I will look at my AutoCad drawings to optimize my length and height since I am now forced to move beyond the realms of the 4'X8' plywood world.
I will optimize the material, not only to add length but possibly some height.
I read Mike's Skinning Post and am now going the CPES, Epoxy Filler and Uniflex 255 route for my finish.
Splicing the panels and using the Epoxy Filler to hide the seems gives my many more possibilities.