grow room idea! need advice.

i have a 4x3x7 grow tent that has a door in the front and opens up completly in the back. i had the idea of opening up the back and using pvc piping and mylar to build and extension of 4x3x7 so in total i would have a 4x6x7 grow tent and i already have fans and one 400watt hps light, and i was thinking to add another 400watt hps. so all i would have to buy is the pvc pipe, mylar, and a grow light... it would be inexpensive and easy to do and i would have double the space and be able to grow and flower more plants and get more yeild! does anyone have any tips or pointers or see why that wouldnt work? or can think of anything else i would need? thanks in advanced.
 
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