Firstly I cut the entire cardigan from one fabric, rather than using a contrast fabric for the bands.
Secondly I cut the sleeve bands with the stretch going round the arm rather than the other direction as per the pattern piece and layout diagram. I also left off the belt and buttons and buttonholes
The bands are all different widths and don't feel particuarly substantial. I would probably like them all wider (maybe not the hem band). In comparison to the Blackwood cardigan (which I don't have but I've seen lots of pictures of them made up), the bands are all narrower and the front is a different shape (unsuprisingly).
The sleeves are not full length, and they are very wide at the end. (as you can sort of see in the model photo). In my view the sleeve would be better longer and more tapered towards the wrist. The sleeve bands should be replaced with cuffs which are broader but tighter.
If I am not going to make the buttons and buttonholes, then the curve of the front should be altered.
I made the largest size (an 18) and its quite loose, however this may be needed in a thicker fabric.
I will still wear my tie dye brown version, probably in the summer as a lightweight coverup as its very thin. On this version, I am wondering about removing the hem bands, tapering the sleeves and adding deep cuffs to bring the length more to my preference.
It needs pressing or the bands somehow topstitching, though I think zigzag stitch would look wrong on this fabric (would be ok on something thicker), straight stitch would stretch out too much and the coverhem might struggle with all the layers at the seams. Unlike a sweater knit it should take the pressing without any problem so I'll try that first.
It was definitely a useful exercise and I can make something I like even better the next time I use this pattern.
I'm not sure whether I will now make a tee shirt out of the rest of the tie dye fabric (and make the belt for the cardigan having decided not to!) or go straight ahead to making the planned cardigans.
Either way I am busy over the next few evenings and the weekend so it will probably be sometime next week.