Thats great man! (need bigger wheels? Bearing races? Secret elastostart?)
All we've raced are zuccinis with wheels so far the last few years. That is very cool that you spend time with your kids on projects, it is so important to them. My daughter and me have made at least 10 styrofoam-based sail boats over the last couple of years, some fancy, some not (like a 6 master that a ferry eventually ran over, good sailer tho). What was cool is that we have recovered a couple of them days later, miles away. Its a simple thing and sortta dumb to most but we both are excited at it and have great fun doing it, making them is a blast (we tryto use just junk off the beach). Our last boat sailed about a mile across the harbour and the kids found it docked by our friends (big) sailboat at the local marina the next day. It is amazing how much fun you can have with your kids and fairly simple projects. Our other favorite thing is flying kites but it has admittedly been a while. I found a great project book a while back that had newspaper kites in it, very easy stuff, and ya know what? They flew! (any1 wants plans I'll do an article, just pm me).
Stuff like this with your dwarflettes is priceless, it is things they'll remember for years (maybe u too), it teaches them all sorts of principals and the best part is that it is a lot of fun. Never let your kids stop havin' fun! This world can be a pretty crappy ball of wax, let 'em be kids 4 as long as possible imho
, and bring out the kid in you too! The pic is the 'SS Elan', just (made from) junk from the shore but we still use it 2 years later (needs a new mast tho), only casualty is Big Dad, a little plastic lion that bailed on us the first trip out, we suspect he wanted to swim to Africa.
All I have ta say fer now