Custom Bb Code For Ipboard For

I run a guitar teaching site and I recently installed IPBoard software for the forum. One of the tools we use for teaching is something called Tablature or ‘tab’. It’s a bit like music notation but simpler. all it is is 6 horizontal lines that represent the 6 strings on a guitar. Numbers are the written on (or inserted into) the lines representing the frets where the fingers go. The blank tab looks like this:

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This is what I want to appear as BBCode, but it should be Courier New font, which is fixed width. That’s the only way to keep the tab legible.

I know it can be done because anther forum uses it, although they use VBulletin software. Attached are some screen shots of theirs. I have created several custom BBcodes myself, but I can’t get my brain around how to do this one.

Any takers?