Anthony after checking with our other Admin, I am not sure either about your qualifications on sponsorship. The best approach ( I personally believe ) is to order your wood to complete the project. To answer your question, if you have a mini-table saw like a Proxxon, Micro-Mark, or Byrnes, then yes, you can rip your own pieces. For the most part, this is what I did.
For instance, if all of my beams are 1/4" thick (example). Then I would order 3" x 12" x 1/4" plank(s). ok, so if the beams are 3/8" wide, then I just rip off as many beams as I need. This way you have more control over the EXACT dimensions. Sometimes, the milled lumber might be a little different from piece to piece from a hobby store. With your own saw, you can get the cut tolerance as tight as you wish.
These are just some of the ups and downs of scratch building. It does take a few more power tools to get things done.
However, you can still order wood from Dave at the lumberyard. Just get together your list and just order everything you need. I think he is very reasonable on Cherry as he has a lot of it. Pear is a little harder to come by and a little costlier.
Since Mike first designed and laid out the 1/47, his Bill of Materials for that scale might be right on.
If you do not have one, a power scroll saw is a must. Unless you have a jewlers saw and that is possible, but can take more time. I have a drill press and I bought some sanding wheels and converted by drill press as a spindle sander. I think Harbor Freight has a package of different size wheels.