I'm somewhat handy with DIY and my first and only attempts at sump building (for my 225 gallon) leaked and required an ugly patch job. While it's still no answer to your question I guess I'd also add a +1 to the cautionary warning. Since you're going with starphire as well I assume you want the tank to look really nice as well. Building a first tank that holds water is one thing... attractive seams entirely another.
good luck tho!
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