@SleepyWill does building fortifications require any special permission from the Earl (or maybe it’s only about major castles??).
If so, Leddicus’ aim is to build a 2-acre bailey (£10), including the Woodfrod Manor but leaving enough space to be (later on) upgraded to “Motte-and-Bailey” (IF and WHEN there will be possibilities for it).
And regarding future advances:
This £10 (spent for the bailey) can be used as a discount to the total cost of a Motte-and-Bailey (£36) = £26 which means that in the future one needs to build a fortified moat (£11) and a Tower (£15).
The (future) project is to have a “Castrum Prafecti” acting as a more dignified seat of the Pafectus Gentis Sorvioduni.