I have a 16" f/4.5. It's total length is around 6 feet. I can move it my myself, but it sucks. It won't fit through the front door unless I lean way over backwards (think caber toss). The van I used to haul it around in was a full size model and it was just big enough for the tube and base. What do you plan to use to take it from place to place?

I would suggest putting soome sort of reinforcement on the tube where the alt bearings are, then mounting handles of some sort there. Actually, I would first suggest getting a 7 foot dowel and try moving around the house, shed, garage, whatever. 7 feet it bigger than it sounds.

Check out this program as well. It will help you get your figures.

Here is the place I was going to go for my secondary mirror when I was going to rebuild my 16". Protostar

The other places I had linked have moved on. Too bad too. I had a design that would let me fit that 16 in the trunk of a Dodge Neon.

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A Nerd can figure out how long it will take the original Enterprise traveling at warp 6.5 to travel from Regulus to Antares.
A Geek will think he can use that to pick up a girl in a bar.
A Dork knows he can't pick up the girl with it, but will hang around for hours anyway, just in case she asks.
She might. You never know.