Your question was one that I had considered for a long time. I bought my plans about a year ago (1278, maybe one of the first AC Spruce sold) and have been on hold for awhile while other "life events" worked themselves out.
That being said, I chose to use the MGS products for the virtually zero odor... I too will start on the basement and graduate to the full two car garage as needed... I went to another builders layup who was using the MGS and was really surprised by the lack of fumes / odor / etc. Whether this equates to "safe for infants" I seriously doubt it, but its a far sight better than some epoxies I have been around. And yes, I realize that just because I / we can't smell it doesn't mean its not harmful...
In any event, in the next few weeks I will begin building the bulkheads and sides... my kids are older though, (6,6,9, and 13) and actually anxious to help Dad build an airplane.. (seems none of their freinds Dad's do anything so nutty.. go figure)
Good luck deciding, check the MSDS sheets for all; the approved epoxies and decide which will be safest for your own situation,
Stew