Egon,
I like the simplicity and modest investment. One question... Are you using a special chain to rip the logs. Chainsaw blades are made to crosscut. Have you modified your saw at all? I had a friend that tried something similar years ago and had problems with the blade "wandering" and also with cutting speed. He gave up, but the truth is, he was no mechanical genius. I was just wondering if you sharpen your chain differently to rip?
Greg