Dumpy Part 2 Winget Four/40E Lister ST2 Diesel Head Gaskets & Oil Leaks Fixed

Well thanks to the Guys at classicmachinery.net Dumpy has been identified as a Winget Four/40E. His hydraulic hoses have been replaced, the brakes are adjusted and working, plus he's been put to good use in the garden. BUT... He leaks oil badly and smokes like a chimney. Cue the simple task to replace a few gaskets, as supplied by stationaryengineparts.com. How hard can it be??