I am making a toy boat for a project. Can anyone please help?

Question

It needs to fit inside 36cm 31cm 25cm box. It needs to be constructed using hand tools, the boat must float, even when more than 200g of sand was dropped in. Thank you so much, if you help :]

Answer 1

One word STYROFOAM U know  family pack of hamburg.

Answer 2

200g=2.94cups and thats to convert centi to inches

Answer 3

its not a boat if it doesnt float

p.s.- Home Depot hasa classes fore that on saturday just saying