I dont understand how a 15gallon HLT was the limiting factor when your MLT is only 10 gallons and it holds the grain. Does not make any sense. 13lbs of grain at the high rate of 2qts/lb is 26 quarts= 6.5 gallons. Why is your HLT limiting you in any way??????:ban:
Why not just cut a large hole in the lid (or bottom if you prefer). That way you don't lose any volume capacity.
You can create a lid easily using the piece you just cut out. Weld four 1" steel solid washers, spaced equally. Done.
I've attached images of his stands for those interested. For $300, the stands do no include casters or burners. They come as pictures in the first picture without the keggles. Just a nicely welded, cleaned up 2" steel brew stand.