Ohh, I love Montessori!
At home I try to have something in every room for all of the kids, ages 1-6, can engage in and appreciate. Artwork and photos are hung at their eye level. Natural artifacts are arranged on our shelves and tables for them. There is a kitchen cabinet with utensils, dishes, and clean-up supplies that they can reach. Rather than turning the home into a classroom, things that interest children are part of the layout and decor.
We bought the marble job for Ds when he turned 4. It was a bit too soon at the time, he enjoys it now.
All of the kids like to stack the wooden cube tower at home.
I like to buy child-sized dishes and utensils. A few that the kids love are: wooden rolling pin, serving tongs, serving trays, china plates & teacups, ceramic teapot, hand broom & dust pan, water pitcher, assorted placemats, linens, & napkin rings.
I put together a collection of interesting small tins, empty lip gloss containers, assorted types of coin purses, small cloth bags, (and other little items which entice small hands to practice zipping, snapping, unscrewing, lacing , etc.)
Sewing items are great to have. Keep it all in a small tote or purse and you can take the sewing job with you.
I hope you find some of this useful.