Hi Scott,
Congrats on your readiness to "energize"!!
You'll need the boards with the following dimensions...
1 for Sides: .75” x 9.25” x 34”
(nominal 1 x 10 x 34” long)
1 for Runners: .75” x 9.25” x 23”
(nominal 1 x 10 x 23” long)
1 for Inner Sections: .75” x 11.25” x 34”
(nominal 1 x 12 x 34” long
NOTE: These dimensions already include the extra 7" required to keep under the rollers at all times! An absolute requirement for this project and especially any other project that has cut outs of any kind.
If (and only if) you are familiar and knowledgable with the techniques of using sleds or carrier boards, you can subtract 7" from the length of each of those dimensions and put the shorter boards on a sled that provides at least the lengths as shown above. Otherwise, play it safe and use the original specified lengths and all will go smoothly for you.
All the Best...