Would love to see pictures and details! I have had an inkling about building my own roaster for many years. I am currently roasting with a Behmor which I get by with, but is a pretty crappy roaster and I won't be sad when it dies.
Indeed, I would say green bean prices have roughly doubled in the past 5 years. My last order was almost $8/lb for what I would call subpar guatemalan beans, and that was buying a 50-lb shipment which I stacked two sales on. I bought a gift card on sale 6 months ahead of time to use during another sale and it was still that much!
That was from Coffee Bean Corral who I have used for many years, but their prices are out of control. I have started to use Genuine Origin who has better prices, but minimum 65lb shipment. I'm just gonna bite the bullet and go with them in the future. 65 lbs will get me through about 9-10 months in my household and the beans last much longer than that.