Reddit reviews Light and Its Uses: Making and Using Lasers,Interferometers and Instruments of Dispersion (Readings from Scientific American)
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Cheap laser diodes are very hard to stabilize. Might have better results from a HeNe.
I've got a massive granite slab floated on water filled truck suspension bags. A good substitute is a deep box filled with sand and a piece of kitchen thickness granite counter on top. Tack everything down with beeswax for alignment.
If you don't already have it, get this book ==> Scientific American -- Light and Its Uses, a collection of articles form C.L. Strong's The Amateur Scientist.