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user79376
OP here. I'm still running the conversion and it's still fine.
I would update the PDF, but I can't find the original document
The major change that I've made since the original is to replace the hacky garden wire circlip with the original Brompton one - you need to file back the inner face of the smallest cog to get it to fit, but I did have problems with the wire coming out and leaving rattling cogs. I wish I could just find a thin-enough circlip of the right diameter - if you do, please let me know.
The shifting is a little temperamental. When the cables get sticky or the jockey wheels clogged I need to throw the shifter from 1st to 3rd rather than trying to go from 2nd, but the convenience of 3 close ratios for my flat commute outweigh the negatives for me.