The hatch on the underside are also massive. An OS 1.40 is totally lost when placed in the engine bay.
With the cowl and the pipe tude removed, the flat underside is the datum line. Should make set up rather a pleasant experience for a change.
The nose ring and fire wall have the trust angles gigged in during the construction phase and are prill drilled for the mount/engine combination.
I'll fit the engine this weekend, I'll be very surprized if it isn't 100% spot on accurate.