What a wonderful Grandma you are!! So patient! I have 6 under 10 yrs old and I do alot with them and have with the older ones when they were this age. I know! what it takes to work with kids and it is so great to see you enjoying your grandkids and sharing your love of creating! Sounds like your daughter learned( and inherited) her creativeness from a wonderful mom!
I spent alot of time with both sets of grandparents and I put alot of emphasis on creating good memories for my grandkids to have like I have of my grandparents. My grandma use to play Sorry with me when I stayed and I learned to garden with her and my Grandpa so it is so important to pass down to the next generations!!
Look forward to seeing your progress! It sounds like an ambitious project! I'm sure you will have so much fun with those kids making it!