Home Box Modular is a very easy system. With the Modular system you can build your tent exactly how big you want it and also in the shape that fits your grow area the best. This way you can use more of your grow area.
You can find more information about Home Box modular at the following link:
At the bottom of the page you'll also find a calculator with which you can choose how you want your tent to look like and it will tell you which parts you'll need.