None of the parts are bigger than the 2.x laser bed (except the skins which can easily be cut with a simple circular saw and guide rail).
Here are drawings for the rails in the x axis direction (the y axis is the long axis). Each x axis box beam consists of 11 cut parts, but there are only 4 unique parts.
Here is a view of the an assembled x axis box beam
Dimensioned drawing of the beam end member:
Dimensioned drawing of the mid beam member:
Dimensioned drawing of the x axis end cap:
Dimensioned drawing fo the x axis scabb plate:
There are a few things to note here. The end member has a square hole cut in it with a channel that goes to the outside. This is for a bolt to go through so that one can attache the extrueded aluminum guide rail. The end cap goes on either side and does not have the channel. This forms a box to retain the bolt. The strucural members are held together by scabb plates. The plates and the members have 1/16" holes in them which are aligned so that 1/16" pins can be used during glue up to maintain alignment. Further, the sizes were chosen to give maximum beam hight while maintaining the ability to cut two or four peices from each 12x20 bed peice.
There are 16 x beams needed for the box, so there are 176 pieces that need to be cut and glued together to complete the x axis beams. It won't take long to cut the pieces (maybe an afternoon). I'll do that while watching the wood woorking shows on PBS on a saturday. Glue up shouldn't take too long either.