XYUV hotwire machine - axis visualisation wrong

My XYUV hotwire machine (FOAM=1, config here: github.com/monkeypants/foamcutter/tree/master/foamcutter) seems to work correctly. It executes g codes, refuse to go past the soft limits which are in the right place, etc. However, the visualisation in AXIS is wrong. It's was crudely based on the axis_foam example. I have two problems with the layout of the machine visualisation in axis.

What I see is 3 pairs of parallel axes on the screen, XYZ and UVW, with {Z,W} oriented verticaly (and unused), {X,U} left-right and {Y,V} front to back. There is a red box representing the work area of my machine. It's confusing because it's rotated 90 degres and mirrored. I would like to rotate it -90 degrees about Y axis (pull the top of the work-area towards me), and flipped about the {X,Y} plane i.e. {X,Y} facing me with {U,V} behind it ({X,U} vertical).

The intersection of {X,Y} is in the correct position at the side of the work area (well, mirror image of correct), but {U,V} is shown a small distance along on the {Z} axis (maybe 200mm, something like that) not on the other side of the work area where it is in reality (1500mm away). I'd like to increase the separation so it's on the extreem of the work area.

Is it possible to change the visualisation to the way I want it? I didn't find anything in the docs, did I miss something? How do I go about that?

Ah, great thanks.

I had started trawling through `grep -i -r "foam" ./` but it's my first encounter with the code base and I'm still chasing leads all over the place trying to figure out what's going on. I suspected GLCanon was significant but hadn't made it into rs274 yet.

That's cool, it didn't occur to me that g-code preamble might be used to control the UI behavior too.