I think the mantra for anyone heading down to Moyasta is "call in advance" as there's only a small band of volunteers keeping the place ticking over and they're not always there. From what I hear, a planning application has been submited for a shed/museum which will house the stock.
The tarpaulin may obscure the view of the stock but it's a necessity, especially around that neck of the woods where the sea air would eat away at the metal in no time.