check out some online distributors. theres one in san diego....aeromarine. also, uscomposites.....tap plastics...
theres a few.
stringers can be done alone....but help makes it easier. gotta move quick alone or resin gels in cup. remember, they all will produce heat. epoxy can get hot enough to melt the cup its in....or at least too hot to hold. spreading it out like in a plastic dish...plate....paint tray with help radiate the heat and minimize premature gelling. do a search on here if you havent already....one stringer at a time....or put boat on stands....if not, at least off of bunks. good luck man.