David:
Glad to hear you enjoyed the course. I did, also, when I visited a few years back ... when Alfonso was kind enough to drive me down from Madrid.
The one feature of the course that sticks out in my mind are the number of greens which are very long back to front and divided left and right by a tier, providing two very narrow targets. Only a very, very good player would design something like that, and Arana of course was once the Spanish Amateur champion. Neguri, in the Basque country, has a few similar greens so that must be part of Arana's style.