I am building my own engine from parts. An interesting note is that telling someone that you're building your own airplane engine generally gets the same reaction as when you say you're servicing your own home HVAC...another highly protected industry. Anyway, it's fun, a great learning experience and not really that hard to do...which is essentially the basis for amateur built aircraft. Back to work.... I packed and shipped my engine parts to Aircraft Specialties Service overhaul. I cut six plates and some 2" round stock to create my own crankcase through-bolt hammer cap and hold down plates. I'm happy to say that the Harbor Freight Tools 48T metal blade for my trusty craftsman circular saw ripped through the 1/2" steel plate like butter and only took about 20 seconds to go through the 2" round stock - must faster than a band saw for heavy metal cutting.