How to make a Portal Gun

Step 9 More detail

Two thin strips of foam were stuck to the side of the barrel and shell to add detail and little triangles of foam underneath the plastic window bits to fill in. You can use clay or plasticine instead. A hole is also cut out of the barrel for the clear window section to go in later.

A big disc of the kneeling mat foam was cut and tapered to the diameter of the paint can and stuck onto the bottom. Make sure to cut a hole in the same place on the foam as the can for the barrel to slide through. The top of the can (the back of the gun) was cut off to bring it to length.

This is where wood filler is invaluable. I used Ronseal Wood Filler which spreads on like a putty and sets hard. Go over the whole model and fill in any divots or gaps or uneven transitions with wood filler. This is crucial around the parts cut with the scalpel to smooth it out and lose the jagged cuts. Take time with this as it is where things will all smooth out and look neat. Sand it down with fine paper so it's nice and smooth for painting.