Yeah... my prior idea for 20k was probably a bit over-estimated.. It depends on how you do it... If you're able to home build a GEM or get a good one 2nd hand, you'd probably be right....
I was factoring in the price of a Paramount ME.. I suppose a Losmandy Titan would hold the 16" for visual use without issues... and that alone cuts the estimate down to maybe 14k... adding price of good rotatable rings (again if you could build your own, cheaper..)
A home made gem might not cost you too much at all if you have the required tools and access to cheap materials..
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