probably no help
but occasionally my bike will do a similar thing with the indicators. Id say this is due tot he battery being poked.
perhaps yours with the extra electrical load is doing similar.
in short - hows your battery?
Ultimately its the small details that take alot of time
been flat out working most of the time so have taken to trying to get just a few pieces done every night - slow progress but progress none the less. Now have everything that was to be polished polished. Just a couple of small parts wanting painting
i am almost certain that section would be available as a patch panel
otherwise get friendly with some one who has a sheet metal bender
edit:
just read your previous comment
would it be all held in with spot welds?
thats the stupidest thing ever written on oldschool
jokes
the dish is a bit much
there was a limit to how much of a strip you can get installed and still be cert-able - i forget the limit, something like 20% of the og width?