I am not sure that I understand what you mean by cutting the corners off of logs.
On a band saw if you are cutting anything that is round in cross section you need to support it in a sled to stop it from twisting.
To be honest I have a Google Pixel 5 phone and a Chromebook and I have to say that it is amazing the things I can do without problems. I think that problems arise when you are trying to merge things from 2 different manufactures.
I do have that book I think it came with the saw when I purchased it. If it is worth that much money I think I may well sell it.
I think the later saws than mine did come with an extractor port under the blade but I am happy enough with my solution. It is by no means 100% but is far better than...
My Inca that I bought new in the 1980's has the same holes at the bottom of the front cover. I block up the one below the blade guides with a piece of wood and connect my shop vac to the other as well as under the table.
I would suggest that as an average home computer user you do some research on Chromebooks.
We no longer have a pc of any type having now gone over to a Chromebook and I don't think we miss anything we had but are pleased with the lack of issues we now have.
There is a channel on you tube called Restoration Couple and the guy has almost finished a workshop build using the same panels it seems like a good solution and would be well worth a watch of his videos showing his progress.
You are right to be cautious Ebay do not have a facility to buy something after your approval and Paypal don't have a facility for you to pay and only send funds after your approval.
If you really want it tell the seller that you will collect and pay at the same time if that becomes a problem...