I've been looking at air systems like this all day and yours seems to be amazing. I'm a wheelchair user (motorcycle vs bambi 20+ years ago) and being able to drop the height of a vehicle to get in, then air up for going down the road or off road is something I hope to have set up in the next year or two. Your mods aren't just practical for normal users, they're enabling for the handicap-crew too!
Wish it was the profit margin! Unfortunately a majority of the costs are wrapped up in the air spring/accumulation assembly. But that’s what it takes to get the system to work properly