1) 10 hp as mentioned above is probably woefully inadequate. I good 10" table saw will have a 5 hp motor and even that is going to be pressed hard on a 2-1/2" single-pass cut.
2) 8' long arbor ?? It that really what you meant? I'd think at 8' long a 1-1/2" (40mm) shaft would have significant whiplash.....and that's without the blades cutting 2-1/2" thick material. I'm not a mechanical engineer either but I'd think you would need something more on the order of 3" to 4" diameter, and perhaps hollow (think pipe) as vs. a solid arbor due to the weight.
3) Stainless steel arbor......why? Extremely difficult to machine to needed specs vs. steel.
I'd like to know if you actually end up building this as described so I can make sure I'm not in the same state when it is started up for the first time....chuckle. In all seriousness though I think you need to have this designed by a professional. Or, better yet, purchase a machine made for the job.
I would recommend against trying to "design and build" your own. This is a job for a mechanical engineer. You put your life, your employees lives, and your entire business at risk. If OSHA walks into your plant and sees something that is obviously not engineered by experts, without all the proper safeties in place, you can expect heavy fines.
Paul makes a panel gang rip saw for this very purpose. They have models that will rip close to 3" thick.
They can be had used if you watch the auctions.
I don't think it is practical to make a machine like you are talking about. First off what happens when the material binds on the blades? What kind of kick back safety is that going to lead to? There is a lot more to think about other then just getting an arbor and put a motor to it. You are better off in the long run to just purchase one of these machines used. The machine will have some resale value later, the one you make won't. Not to mention what happens to you when someone at your place gets hurt.
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