What an interesting project!
I recently had a bass commissioned, and it cost an arm and a leg, but at the time (through selling other things) I had a spare arm and leg so it was all good. It really is a great experience.
Whilst this bass is being built to your specific budget, it still meets every requirement you have and that's the beauty of it. Great build!
I'm also fascinated by the built-in stand concept. Such a simple idea, but potentially could be a huge development in bass design.
Best wishes with the build, enjoy every minute!
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RK