Hi,
to be honest thats a really advanced setup for a first time Pandoras Box use. But it also looks pretty well already. Not very much to add.
Here a few comments which I would take care of:
1.) The right panes looks a bit "wavy". You need to do some more adjustments on that one to straight out the image. But it is on a good way already.
2.) The left panel looks pretty well. Only the bottom lines are running not parallel to the panel edge. So thats something to get on as well.
3.) The back panel is pretty good. Also the overlapping area is pretty good. Above the lower circle there is little area which looks like double lines, but thats maybe also caused by the picture. Not so easy to tell from here.
3.) If you do a warping with softedge I would always set one mesh colour to red and the other one to green. This will make nice yellow lines in the overlap area and helps a lot to see double linse.
4.) for the setup you are using I would also cut out all grid pieces you do not need. To see a good result better use a "real" picture instead of the grid. Maybe a sky or something bright. The select a mesh point and press "D" on your keyboard. This will delete the box which is up and right from the selected point. If you want to have it back, press D again.
5.) Right at the edge of the front panel, I would cut out a whole line of mesh points. That way you have a much better chance to setup your mesh on this edge. Right know the lines from the back panel are running up to match the side panel. You can avoid this if you delete a row of boxes in this are.
6.) same as 5 for the right panel, back edge.
7.) On the back panel I do see a black upper right corner. I don´t know if this is a shadow of the front right panel. For me it looks like the front right panel need to physically move up a bit.
8.) Save your settings during your work as a .wrp file. This file can be edited to do later adjustments.
9.) The .wrp file cannot be used in Pandoras Box. So you need to export each file as a .x file with the "export mesh" funktion. This .x file needs to be loaded into your Pandoras Box Project. Once you did that you need to put load it on the camera mesh of each camera. If you are using a Server the Camera 1 will be always the primary output and camera 2 the secondary. It is important to put the right mesh on the right camera.
10.) Once you did that you need to set the softedge on both cameras. This is like a tryout, but as you have made it a pretty good 25% overlap you should only need to put SE R to max for the one Camera and SE L to max for the other one. SE RC and SE LC can go to 0. This should give you a pretty good result.
11.) Move the x-ofset of both cameras to the center of your screen and now you are able to bring nay layer up to any of your panels. Or on all panels.....
I hope that helps you. If you have any questions please feel free to ask.
Regarding to your local position you might also consider to attend a Pandoras Box training near to your place. In these trainings you will learn all the great things about Pandoras Box. Altough it looks like you know a lot already
best wishes
Patrick