Hohner Kingstar 20 suggestions

[Kesi from Hungary]

Hello all.
A few weeks ago I received a nice Hohner kingstar 20 amplifier from a friend.  It is from the early 1970s. This amplifier is actually an Elka trx 20 but commissioned for Hohner.  Originally there was also a reverb/tremolo unit, but that was removed by a previous owner.  Normal channel works well and tremolo channel actually even nicer and clearer, only without tremolo effect and there is no gain at all in the amplifier.  I have already replaced the filter caps.  I'm also going to install a fuse now and in a few weeks I'll get a set of 6p14p ev. Now I have a few questions.  I'm a beginner in amp stuff.  Do you have any suggestions for placing a master volume and/or gain.  In principle there is room for 2 pots on the control panel.  Perhaps there is a part in the preamp that is no longer used by the tremolo.  Another question what to do with the connections for the footswitch for reverb and tremolo.  I want to keep the option to put reverb back open in the future, but it could then be controlled by the potentiometer.  But maybe there are more ideas you can come up with?  Everything is welcome.  Thank you in advance

[Kesi from Hungary]

forgot the schedule

[sluckey]

This should be a strong contender for the "Crude Homemade Chassis Award"   

[Kesi from Hungary]

its the Ferrari under the Italian amps