Blower cabinet with reservoir. Blower model: Ventola 6 151 50. The pressure is 50mm of water.

Top of windchest showing the channels for the offset pipes:

The pallet spring design saves several inches in height over a traditional pallet spring:

Bottom side of windchest installed in the organ with the blower cabinet removed:

The whole windchest assembly weighs 10.3 kg (22.7 lbs). Here's the breakdown in grams: