Anybody see anything wrong (UPC) with this plan? Main waste is 3". Vents are 2". Yellow things are Combos. Blue thing LowHeel 90 Vent. Two Bathrooms each with sink, toilet, shower. One Kitchen sink, one drain for washing machine. Three vents penetrate roof. Drain takes a 45 degree dip and goes out front into septic system (not shown). TIA