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I think that grinding a mirror has its own rewards, however, you will have make the grinding surface out of the spare blank, then a focult tester and then get it coated. This is a lot of hard work and does take some time to get right. That said though, hand ground mirrors usually are better than machine ground mirrors. Just bear in mind that making you own scope can be a long process. I did it once took 7 months before everything was up and running. That was including the German EQ mount with worm drive.
My advice is buy the optics and build the rest. Much less time involved and you can see everything come together quickly.
Anyway just my two cents worth.
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