Costume is complete and is posted in the appropriate forum on "Replica Costumes".
Also, I started building the necessary transport crate for Sasha. I need to protect my work as I travel, so secure mounting inside the crate is a must.
I have not worn it for a long period yet, but the load-bearing belt is fitted just like an Alice backpack kidney pad... so I anticipate being able to carry Sasha for a long time.
The belt is heavily padded and fits snugly on my hips and the top of my butt, just like my proton pack (which I've worn for 10+ hours straight at conventions before).
I did also include an adjustable shoulder sling into the belt rig as a backup, in case the belt doesn't bear as much as it should, or if I want to shift weight between the belt and sling.
The belt and sling are hidden under my vest, so they are out of sight, and it looks like I'm holding Sasha... but I'm not really.
I'm glad you're inspired. A friend of mine is also putting together an Engie costume (with toolbox). I'll see if I get any good photos of us, and I'll put one or two up.