I tried to make a similar sand box as yours but as space was limited I decided to only make a 1 seat version. As a first attempt of making something proper I think it turned out well. Base frame is made of 4 x2s and the lid and seat contruction it pallet wood planed to make it nice and smooth. Granddaughter loves it.
Built from Plan(s)
Estimated Cost
£20 for bags of play sand, I already had the 4x2s and pallet wood is free.
Estimated Time Investment
Day Project (6-9 Hours)
Finish Used
no finish as yet
Recommended Skill Level
Beginner