Are you powering both elements in the 1157 ? That has got to be really brite , is that at 8.4 volts ? I probably go with a lipo 11.1vfor my lites and other add on,s and use a regulator to get my voltages.
I would think starting 6 engines would be a major under taking , not to mention getting them to all run at the same rpm,s . How close are you to done with it ? More pic,s please

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John , did you go with a bolt on wing , if so how did you attach the leading edge ?
My biggest road block right now is theengine I,m going to use . Got to be a 4 stroke . I do have a Saito GK 1.00 that I just put new bearings in. Guess I could run a 3 blade prop to get ground clearance ,just seems like the 1.00 would be overkill . Layed it over the plans and would have to modify the cowl to get it to work.