Hint for Clue #4.
Once you have your pieces cut and semi assembled (i.e. assemble the aqua/white HST's) DIVIDE your pink/aqua HST's into two batches of 40. Work one batch at a time to assemble the block in either alternate 1 or alternate 2. Once those 40 are complete - reboot your brain to flip it all around to make the opposite alternate blocks with the remaining 40 pink/aqua HST's.
If I don't do it this way and make all of the same block at the same time, I know I'm going to mess up. (heck, I probably still will, but this is the plan!).