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I am sure the usual suspects will tell you to look into EAA and Night Vision options rather than going down the large aperture path, however, until they create a NV device that shows all the beautiful star and nebula colours, I will be advocating for large apertures but in more compact structures.
The Rolls Royce of big scopes here in Australia is surely Pete Read's superb SDM scopes many of which I have been lucky to view through, but if a more manageable weight is desired then there are options in aluminium and carbon/kevlar that can be considered.
I like the stability of the structures like SDM builds in preference to the lightweight Hubble and Obsession Ultralights so I went with a clone of the Spica Eyes designs of Tom Osypowski.
When planning my scope I also saw a scope made by Bratislav Curcic with help from Stefan Buda, this was an excellent, compact and light
scope built to exacting standards with lots of custom components.
My own scope managed to shed about 25Kg from what I had previously built, achieved with the use of aluminium, carbon, kevlar and titanium components but that did increase the cost a little ( $$$$$ )
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