You say your soldering them together, I hope you have an electrical background and Know what you are doing.

Remember: Going cheap on wiring is a recipie for disaster, I don't see a big fire hazard with your plan but I do see a big electricution hazard with your plan.

I would buy some boards and mount electrical boxes to them and use standard white plastic socket plates and wire it properly. Plastic blue box less than $1.00 each, white plastic socket around a $1.00 each.

JMO
Better to be safe than dead!