There was also an article in WI 374 December 2018 ‘Bedford Beseiged - A Lion Rampant Seige Campaign’ by Dan Mersey. This gives a variety of forces for both Beseiged and Beseigers and a number of scenarios. The action takes place outside the castle walls so no large castle is required to play.
There was also a Dark Age adaptation by Dan Mersey - ‘Landwasters and Raven Feeders’ in an earlier WI but I don’t remember which one.
Cheers
Mike