Fits in a 100x30 Block Mk1 - 16 Assemblers Mk2 - 20 Assemblers Mk3 - 24 Assemblers Each tier takes advantage of the 25% proliferation of the previous tier Three PLS stations: one for each tier. Convenient for dumping Mk2 and Mk1 to be upgraded or using Mk2 if nanotubes are running low.