This Stug is fake ! Can't tell from the bottom what it is based on. The top look authentic at least.

The fake Stug was actually manufactured in Ontario.

Started as an FV434 ARV (Armoured recovery Vehicle). Top is scratch built.

http://www.willysacres.com/StuG3.htm

That picture is not of the Stug, also thanks for posting the link to the build.
I took a look at the pictures of the Stug build and for what they started with  it looks like a vary good tank. 
They did a lot of hard work and spent a lot of money building it and the builders should not be insulted because it is not a real WW2 German tank. They do not say it is a real Stug and make a good attempt to take it out to show people the tank and use it for shows.
Anyone who chooses to take on such a project for the love of tanks should be thanked at every opportunity .
Just the cost of storing, transporting, fuel and oil and tank upkeep is a HUGE cost!
Their love of the hobby and skill should be appreciated, now that is a model builder.

If you go to a show and see recreations or real tanks, jeeps, or trucks on display or better yet running on the field , make a point of showing appreciation and thanking them for bringing there vehicle out.
Don't be a rivet counter that is not good for the hobby, any hobby the point is to be happy.

Cool Stug !!