According to NAVSOURCE, the Nicollete was based on a C1-type cargo ship hull, and was derived from the Alamosa-class freighter. The one photo of the Nicollete at NAVSOURCE seems to show the deckhouse aft with T-shaped derricks. There are other photos of Alamosas under the AK heading at NAVSOURCE which confirm this
http://www.navsource.org/archives/auxidx.htm
Your best bet on an Alamosa would be the offering from Loose Cannon
http://home.earthlink.net/~loosecannonproductions/
The website says that it is a coming product, but I would check with Hugh Letterly at Loose Cannon to check on availability