I had built a SHO a while back. I built a Boomstick and combined the two in one box. I added a couple of switches. One switch is a pre/post for the boost. The other switch is like the subs switch on the Distortron; it changes the input cap values and therefore the amount of low end. This mod will be explained in more detail on the mods page.
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Nice work. Bet it sounds great!