My old flight box ... (unfortunately the U tops were fixed and not adjustable !)
And here you can just make out it had my panel / glow / starter etc. on it as well : (my ex-wife used to go flying as well !!)
One pal of mine used the kiddies toy that was plastic long thin covered soft metal. You could bend it to rings, around your arm, table leg whatever .. He fixed one each end of his flight box and it gave him flexible adjustable U.... I haven't seen that toy for years ..
Anyway - my main purpose is to arrive at designs of stand that can be used in workshop and also when setting up model in field ...
The 4" paint rollers - now that's good idea.