maby make like 4, 5, 6, cakes (with the board of corse) and then there carve and cover in fondant and use the dow rod to make the exstednded handle or make a sheet cake?
Everybody that reads my replies is going to think, "Doesn't this woman ever come up with a different idea?" lol But everytime I think of making 3-D cakes, I think of putting a sheet or round cake under it. You could make your base cake (and then you have somewhere to write a message on it, as well) and then make the vacuum from a small square cake with a portion of it cut away to fit a small round cake (6 in. maybe). Then stack a couple more rounds and carve it a little to resemble the shape of the vacuum. Use a dowel rod through the cake for support and leave it long to use as the handle and either coat the dowel in buttercream or fondant. What do you think? Hope maybe there is a shred for you to use... 
I love CC 
sketch from another post about this:
and link to that post where it's explained
http://forum.cakecentral.com/cake-decorating-ftopict-176051-vacuum.html
adapt shape and height of tiers
(in this case -- round tiers and much longer handle -- most of handle I'd make out of a dowel covered in fondant/gumpaste with that as hook on end too (as suggested above)
Quote by @%username% on %date%
%body%