As much as all that stuff out on the tube seems heavy, it doesn't necessarily take an equal amount of weight to have a balancing effect. I'm sure there's a mechanical engineer on here that can do the physics, but you may have noticed most dob counterweights are either 1, 3 or 5 pounds. I have a 10" metal tube Orion dob and I have had, at one time, a dual finder stalk with a RDF AND a RACI finderscope, an ES coma corrector, and replaced the stock single speed focuser with a motorized Moonlite. If you had all that stuff in a pile it'd probably be 5 pounds, or at least 3, but I can balance it with a 1 pound magnetic dob counterweight I got from Orion. If you have a truss tube it will be different but I can't imagine it would be much.
All that weight on my nose can give me the sags if I view at very low altitude targets, so I got a conduit strap and about 15 qty 1" galvanized washers. All together it weighs 10 ounces. I put a hook on the bottom edge of my tube, sure avoid the collimation hardware, and I can add or remove weight one washer at a time, though I usually just hang the whole thing on there. It sits perfectly level with the ground if that's where I put it.
One other thing.... at least with a tube dob, you can adjust the counterweight effect by sliding the magnet in different places on the tube. That's a science too, but sort of an art at the same time. I'd start with a 1 pound weight. It does more than you'd expect. I hope that helps.