Parts of this were not posted with the last post. When you get this built you will be the envy of the region! Your Ryobi motor is approximately 13 hp. so it should be enough to cut through most lumber. cutting lumber with it will definitely be a possibility. Wood gears has a shop built band saw and, although it's not to the scale you are talking about, it might give you some ideas on the build. Woodworking plans half way down the page the page. You'll find a tension adjusting idea there too. You can buy the plans but they won't be to your scale and you can see how he did it from the pictures. I also like suther51's idea of the V-belts as tires, it would just require notching the wheels to recess them and they would last a long long time. They're fairly inexpensive and it would also give you the little crown you'll need to keep the blade centered on the wheels. Cut the grooves for them and install the belts before you laminate the wheels together and it should work well. There is a possibility the drive pulley might not be as expensive as you think.