BTOW is the only dedicated shop in Perth with pretty good prices and good service. For DSO's aperture is king so go for the biggest you can get and comfortably use. There is nothing wrong with the truss units and you just a bit of material like rubber matting and a bit of Velcro and you can slap up a shroud for less than 50 bucks easily. Made mine for my 14" and just made another one for my friends 10".
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