Hi from what I understood
With Doman method if there is no right time to teach - your child is not well or happy - you can take a day or two off and continue where you finished last time.
With Shichida method, if there is day when you are not teaching, you should start from day one again. So there is a very strict schedule.
Montessori is basically a method where you are being led by your child. If you see that your child wants to do stacking activities you give him lots of opportunities to do that until he or she masters it. It is a window of opportunity ( exploring hights maybe) and his or hers brain need to do that type of activities. You can get lots of ideas from many blogs on the internet.
You offer different activities but let your child to choose.
You practice it with different activities not just with one
Have you tried Little Math ?