Marti CLA40-H Modification Help ( First Mod Project )

Hey all, I recently bought a Marti Electronics CLA-40H and I'm going about making some aesthetic changes. I'm going to relocate a bunch of switches as well as get a new aluminum faceplate. This is my first big project! Any help at all would be amazing. The first three pictures below is the way it looks now and the last picture is the type of mod I'm aiming to achieve.

Marti CLA40-H Manual

Switch Type Changes & Relocation
There are two switches on the back that I'd like to change from slide switches to Potentiometers and move to the front. Any advice or help finding them would be much appreciated.
1. The first one Is a Stackpole DPDT Switch ( 3a 125vac, 1.5a 250vac, .5a 125vdc ).
2. The second one is a DPDT Switch from switchcraft ( 3a 125vac, .5a 125vdc )

On/Off Switch
There doesn't appear to be an On/Off Switch. Where in the circuit would I add that? And how!? Like the one below

On/Off Light
Like the picture below I'd like to add an On/Off Light. Where in the circuit would I add that? And how!?

Thank you for any help you can provide


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