DAmn, cant find those corner connections nowhere. And without them i cant start a build. though it will take a month to order and deliver 5mm acryl sheets. Dont have it in my home town, only transparent(but it sux). Also have to make drawings for the laser cutter. But it is only a matter of time. ANd there is no problems with getting alu frame. So it those conection that is pain in the as@#)..