From your photo above, it looks like there is a thin wall between the pump and electrical areas. My pump and breaker box share the same area forward of the water tank. It looks as if you could easily remove that partition and have much easier access to your pump.
Also, I moved the breaker box to the right side wall so as to open up space to service the water system. (there was enough slack in the wires to move it without having to take the breaker box apart.)
Additionally, I unscrewed the part of the bed board by the foot of the bed and put hinges on it so that it can flip up under the foot of the mattress, again to improve access to the compartment. I'll try to get a photo to post.
I hope I haven't confused you too much.
Bob & Nancy
2005 ASLYG 30 SO
2009 Wrangler Toad