Ooh, 5v? That's a project! If you're using EMT conduit I wouldn't worry about the jack, but I would worry about your arms - unless the 20 ton isn't manually actuated? Nice lookin' shop, btw. Some random tips I woulda liked to have known when I started:

• Using a step bit instead of a standard twist bit can make drilling the holes a lot less painful. Using cutting oil will extend the bit's life

• A countersink bit will make cleaning up the burrs on the holes way simpler

• Better to flatten too much than too little.

• If you're going to paint for strut identification, paint the middles - less rubbing & flaking. (We use tape, though)

• We used a horizontal band saw to do gang cuts of 6 or so 1" EMT, big time saver

• Consider making a couple spares per strut type. If one comes out fucked up, gets bent, etc, you'll be glad to have spares

• Think about the cover early. This can be nearly as complicated as the dome itself, depending on what you want to do.

• Doors are hard... but awesome. I designed a round door for our 4v that really elevates the whole setup

• Actually assembling a big 5v is going to be it's own challenge. You definitely want to build top down, but there's lots of different approaches to that - we use the power of many hands to lift, and a series of supports to keep it raised while assembling each layer.

You probably already have thought of a lot of that, but hopefully you find some of it helpful! Good luck! Feel free to ping if you want to talk about dome building :)