The first BIMARE 4-X is actually near completion.
The first testsail is expected in two weeks (the photos below were taken on January 25).
The proto is fitted with 100 mm diameter round beams.
Two different masts will be evaluated (both with a 157 x 74 section): a softer version weighting 2,030 gr/ml and a stiffer version scaling up at 2,250 gr/ml.

http://hpbimg.bimare.net/bimare/viewtopic.php?t=46