Worth a go. Nothing too bad about Bb7, just need to get your 1st finger positioned right. My great incentive for getting F and Bb sorted was Dire Straits' Sultans of Swing - that really toughens your fingers up! Now 2 bad chords to play are Db and Eb - nothing sounds quite right for them, and every combination is a bugger to play...

Anyway, for the Fdim you can definitely use xx0101, but I'm sure Maclean starts lower down the scale. Possibly not as low as bottom F, but I'm not sure. For ease of use, probably starting with 2-A might be easier. I'm pretty sure he plays one note lower down and a gap of 6 seminotes to the next note, then he goes up (and down) through 3 semitone steps.

As for whether the Bb7 and Am sound OK, I'll have a go tonight and see (probably just as well I can't bring my guitar into work, or I'd never get anything done ;-) If I get some time, I may look at doing a decent transcription - see how it goes.

Grab.