Model Structures posted:Stranded verses solid wire - at the frequencies you are dealing with it probably does not matter though stranded wire carries more current per given voltage than solid wire and I believe has better signal carrying capability. I would stick with stranded for two reasons: (personal opinion tick with stranded)
While I agree with stranded wire for easy of use, it doesn't really carry more current than a similarly rated solid conductor. The reason some people think that it does is the skin effect. However skin effect at 60hz is not an issue with any wire we'd ever use, it's 8420μm deep, that's 0.33" at 60hz! Also, in order for stranded wire to provide measurable effects for skin effect at any frequency, the individual strands have to be insulated. Wire with individual insulated strands is called Litz wire, I'm pretty sure you aren't wiring your layout with that. 
