Cracking the case and replacing the seals is a significantly more complicated process than replacing the top end. Cracking The Periodic Table Pogil Answer Key on this page. It is something for which I would recommend you have the parts diagrams for the crankcase, the engine covers, crankshaft, clutch, and transmission all printed out and available, along with having the service and repair manual handy.

I removed the top end and that looks ok. The rod was frozen in the crank. I managed to free it with a few gentle taps but the bearings appear to be shot. Thats all I know so far.I,ve been learning as I go for the past few years. I can handle a top end job, clutch rebuild, minor repairs. Have a repair manual.

There are a couple of special tool recommendations in the service/repair manual, but most people already have them or the equivalent. For instance, you already have the ring compressor, the clutch removal tool can be easily accommodated with other tools, and many home mechanics use sockets that fit in place of seal drivers. A good read of the service/repair manual would be in order before you start.