When looking at raw lumber; 2/4, 4/4, 8/4, etc is thickness measure, i.e., 4/4 would be 1" thick, 2/4 is a half inch thick, etc.
To figure board feet, the calculation is Lineal Ft to Board Ft = width x thickness x length ÷ 12 = Bd Ft.
Per past board postings, Warmoth has indicated that while they may use wood sent by a customer to make a body/neck, there are a number of restrictions, off the top of my head:
1.) You get charged the same price as if they supplied the wood. (Never saw anything mentioned about use of woods that they never offer, I guess it would be based on similarity to wood they do offer.)
2.) They reserve the right to reject the order based on the wood received, e.g., if it isn't true enough, warped or cupped in any way, or potentially has any other kind of defect that would preclude the completed piece from passing their normal QA process.
3.) They won't work with cocobola any more as the dust has some kind of toxic allergens; that's the only specific wood restriction I know of.
4.) I imagine that there is a specific range of billet size that HAS to be met for a neck, but never saw that published as a spec.
Before you run out and start buying pieces of exotic wood, you really need to call/check with Warmoth and see if what you're buying is going to work, and you probably won't be buying a lot of stuff in "board feet"...
Laminate tops are 1/8" for most laminate/hollow chambered bodies, 1/4" for Tele Thinlines and 5/8 - 3/4 for carved tops. Most laminate tops are "bookmatched" to duplicate an even figure in the wood. I imagine a solid or bookmatched set of sheet(s) would need to be the same size as a guitar blank, 14" x 19". A carved top is going to need to be thicker than the finished product, so the CNCs can mill them, I'd guess around 1" x 14" x 19"
A body blank itself is going to need to be 14" x 19" x 1 3/4", so in this case to get that size you probably need to be looking at slab lumber rather than boards and will have a good deal of wastage.
In any case, the wood will need to be appropriately dried/seasoned and planed/milled completely true to the specs above. If you look at a lot of these exotic wood sites, many offer "luthier/musician kits/sets" of wood and/or machining/milling at surcharges.
Some of the above is semi-educated guessing, Gregg or someone else from Warmoth can weigh in with more precise data, but again, it would behoove you to call a rep and discuss this prior to buying your own wood to start out with. Could be that something similar to waht you're looking for is squirreled away in someone's "secret stash" at Warmoth already.....