I'm afraid I'll disagree on the use of the word feasible in that statement John.
The whole project was set up to fail.
A friend and I got wind of this program and applied to get on it. As soon as they found out we knew a bit about living in such conditions they dropped us like hot rocks.
The Castell Henllys staff recommended another group that we work with that used the site from time to time and again they were ruled out, even for the bit where they brought in the group of re-enactors.
I know another person that was asked to make the shoes, he makes roman a nd iron age shoes for a living. They gave him a pattern and immediately he said "These won't work" and he offered to make them properly. Their reply was "We know, but that's how we want you to make them." Surprise surprise the shoes were a major issue.
They bused in a bunch of re-enactors from the South East of England and provided them with a huge crate of beer for the journey. they then dropped them straight off on site, very drunk, to demonstrate "How to do it properly". None of these re-enactors had ever seen the site before, let alone lived on one like it.
As a direct result of this fiasco some of the participants got serious food poisoning and Environmental Health were called in. That is why the site is no longer allowed to have experienced groups like us staying overnight in the houses. A great shame because they are great buildings.
I'm sorry to say that this program like so many others made by TV executives looking for "Good television" was deliberately booby trapped from the outset and we all felt really sorry for the poor souls that were there when the trap sprung.