The materials will be expensive! ----Do you have any particular blade in mind? ---- My little one only has a 1-3/4" wide one on it, and I can see a much wider one would be better.
Given the wide cut plans you are going for the wider the blade, the better. Just my observation from what I see with my little jobber.
Keep up on it and if you get a chance get some pix. as you go.

"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."