Hey there where bouts in aus are you? I actually looked at that exact ad last week along with many different options for a similar situation to yours, let me ask one question- can you cut and glue/use tape? Make a trip to your local hardware, my choice was bunnings, grab some 2 inch pvc, not high pressure plumbing pvc, this will blow your cost out but the telstra conduit, grey white or orange bout 5 bucks for 4lm, bargain! I'm building a 3w x 2d x 2.2h tent so i needed 13 lengths-$65. Now you'll need 8 3way corners, bout $15, few t pieces, some fat zip ties, black and white poly tape and pvc glue. I managed to build a slightly 'flimsier' structure as a can hang 6 points from the tents roof panel to the roof of the shed it's in, this is steel and will carry all the weight, lights, fan, filter etc. Go grab some thick panda film, i needed about $60 worth to wrap my frame, plan this bit, pull the panda tight and use the zip ties and a pair of scissors to secure it one panel at a time, overlapping slightly all the way round. Once that's done i folded all the edges and with careful and liberal use of the black poly tape sealed it up airtight. I grabbed a proper panda zip for $50 and installed it in the best spot now, cut the hole careful, reinforce outside with black, inside with white tape and go to work on the inside, creating 'corniceing' all round the pvc with the white tape leaving rounded inner edges everywhere. I chose to break my tent in half (2x1.5)x2, 600watts each, to run side by side tests, different lights etc. Will be making a smaller one for my t5's to veg with creating a 3 room perpetual. All these will grand total under $300, made to size and i can put my vents etc wherever i want, seal up with tape and your done. I'm running two cooled hoods ducted straight up to a y piece, 200ml can fan and filter, keeps temps perfect so far. I would still love a professionally made tent, a big one lol, but this thing is doing everything one i could have bought for 4x the cost and not had the ideal size n shape