I strongly reccomend that you do not build with metricon!
Avoid like a blood stained hungry vampire that breathes out fire.
There are a few people that have had good luck with them in the past, but plenty of people i know over the last 7 or 8 years have had some absolute horror stories.
Well at first glance the houses seemed perfect, but on close inspection there were heaps of absolutely disgracefull problems! From studs being over 600mm apart on a double story house, to bricks not being level, or parrallel, mortar missing, plaster not being glued on, etc. All these problems are just from a house that was just "finished" but the unhappy purchaser is still trying to get issues fixed. His house started getting built over a year ago.
Heaps of issues that you may possibly not notice on final inspection, but as the years go on they will become obvious. They have a big warranty, but even bigger is the number of pages and loopholes within.
Have heard good things about various smaller builders, but of all the people i know that have built a house, metirconartists are the only builder i have heard negative feedback from.