Mofifying Pignose 7-100 Amp

Hello to all from sunny southern California! This is my very first post, so please bear with me. I'd like to make a couple of "minor" modifications to my Pignose 7-100 amplifier. I want to (a) add an "on" indicator light. I love the sound of this amp on batteries. The natural overdrive, when the batteries are at about 75% is hard to describe, other than to say it's a BEAUTIFUL thing :cool: ! But, I have a habit of forgetting to turn the darned thing off :rolleyes: . Preferably, this indicator light would also give an indication of available battery life (maybe dim as energy reserve is depleted), and (b) add a headphone jack. Ideally, this would automaticall disconnect the regular speaker when headphones are connected, and then, automatically, restore the regular speaker when the headphones are removed. It doesn't seem to me that these should be hugely difficult modifications but, not being an electronics-type, I'm afraid to proceed without, at least some, learned counsel. Any help (I know a simple schematic diagram would be waaay too much to hope for), or perhaps a referral where I could have this work done reasonably, would be hugely appreciated. Thank you very, very much.
Playing for an audience of One,
Jack

believe it or not. . . .Radio Shack will have all you need to make these modifications. They even have the batteries for a lot less!
Dan