Choose your target. Ease of access or max your operation or a compromise. It seems you have chosen max of operation. That can come with a price tag of access issues.
That is exactly what I have at a few spots. In one area I have ceiling banisters to grab as I walk over designated well supported zones. Also I use removable protective cover plates with stub legs to temporally place where I step over a lot of switches.
In my opinion, operation had a strong influence in my overall plan.
For this plan, that may mean in order to have access there must be means of reaching all spots, both with ability and stable climbing bench work support.
There needs to be temporary safe stepping areas much like that of an airplane wing. Where ever the stepping areas are, that spot needs to be firmly supported by the wall attachment or direct leg/floor.
Nothing is perfect. there are designs of extreme super access which sometimes may cause limited operation enjoyment.
Your track plan is very interesting especially considering the space confines.
If there could be a reconfiguration of the mid level interfering diagonal track you could have a drop down turntable allowing upper level access.
As with any track plan, if you want to exceed you space limitations go vertical, above and below the bench work footprint.
I still go with a thumbs up.
