Yes - My comments about ~16-18 being the sweet spot factors in those designs. One of the most beautiful light scopes I've used is owned by a german friend...
http://www.deepsky-visuell.de/ATM/20/Bau20.htm
Google translate will get you most of the way there, but you'll get the gist of it from the pictures. Very light design, no encoders, only a tiny heater on the secondary etc. Practical in their typical alpine observing locations, wouldn't work here in Victoria!
This scope makes an obsession UC look heavy! But it's still significant to move around. As soon as you move away from a dobsonian design the mount required becomes just as much a problem (assuming portable use)
I still dream of a 24" F3.3 to F4 scope too.