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One thing that springs to mind Mick is tube's for big reflectors. Although, there's probably not too many people out there making their own scope's these days. There may not be a big enough market for it..
When I made my 12.5" newt I tried to source big dia. tubes to no avail...I got told to try in the States. ( I'm talking 2mm ally here)The price to get a 16" dia 6' long tube from the States was laughable, so I made my own. The next trouble I had was getting a sheet big enough to roll....Unless doing a special order, you could not get a sheet big enough straight off the rack from onesteel.(or anyone else in AU) standard size is 2400mmX1200mm as you probably know.....that's why my tube ended up 15" in dia. rather than the 16" dia. which is what I wanted.. I nearly went 1.2 zinc-anneal but too heavy.
The other product lacking in AU is affordable EQ mount's! Do you have access to a reasonable size lathe? My mount is fairly close specs wise to the Parks mount that hold's their 12.5" OTA and anyone can buy one.....suffice to say I made mine at a fraction of their cost.
Sight-tube's......
Universal fitting motor-drive sub-assemblie's & complete unit's for home-built mounts such as mine..
Curved/straight spider's & holders.
Tube rings.
Primary mirror holder's.
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