Update: I had to do a little repair work (after nearly a year of heavy wear) to the stranded colourwork. My how-to is blogged here.
Modifications: Not too many, really. I knit these in a wooly fingering weight yarn instead of the sport weight the pattern called for, and also went up several needle sizes to achieve the right size (although, I probably could have gotten away with a 3mm needle for the hands, but oh well).
The Harrisville Shetland was lovely to work with and I am seriously considering ordering a whole bunch more – it’s wooly and sticky, making it perfect for stranded colourwork with longish floats, but when washed it softens up and blooms, becoming more like a sport weight. I loved it.
Design-wise, I added seven rows of length to the hand (on the back of the hand: an additional plain row, three rows of alternating red/grey, like in the cuff chart, and then an additional three plain rows; on the palm I just continued in pattern). I also doubled the length of the ribbing and added an extra plain row between the cuff and the hand charts.
I also changed the thumb chart to make it longer (I added the top diamond from the middle finger chart) and shortened the little finger by modifying its top diamond. These were pretty minor changes and easily done on the fly.
As always, I used a centred double decrease to go from three stitches to one at the tips of the fingers and thumb.