This parts pack contains engines, tanks, and other part categories in three sizes that do not exist in stock KSP, namely 5m, 7.5m, and 10m. Parts are color-coded according to the universal electronic color code, simply because the author is an old RDAF radar technician. Hence, size4 (5m) is yellow, size5 (7.5m) is green, and size6 (10m) is blue.
Engines are kept at reasonable thrust figures and are thus not overpowered compared to the thrust/size curve of stock parts. The same goes for reaction wheels. Big spaceships are going to be sluggish, as one would expect.
This parts pack includes the FireSpitter plugin and contains config snippets from the Community Tech Tree by Chris Adderley.