Mate good on ya for havin a crack..well done. Yeh Im new to mapping but it really is a matter of thinking how you go about it. It has a workflow just like the modelling part mate...painful stuff.

I worked (by my little self) a little trick to help the mapping on square/rectangular objects to pull them around in lines (works for circles too).

I posted it in here somewhere?? LOL

Pick ONE line of UV's on the right side of the rectangle..top to bottom then move them to the right a fair bit..scale to line them up. Then use the expand (shift>) keys and you will get the 2nd row highlighted..use 'ctrl' key to DESELECT the first line..move and scale again..just keep repeating the steps until they are straight vert or horiz works either way.

Its a good trick as well when you have UV's really close together...picking a line somewhere and doing the above..saves doing it one by one man!!!

Well done

cheers bullet

P.S if the note has thickness split it horizontally then assign colours to each side..then you can map them OR delete one side..map..duplicate model and duplicate UV..job done