Ok - so better late than never...
I've been digging through the mound of boxes that contain the remains of the former office in Glendale... finally found what I was looking for.
To truly say that the Olomana inspired the FWRR engines, I'd have to see a bit more similarity, in terms of detail and design.
Wether you see the similarity or not, I can confirm, 100%, that both the Olomana and
were studied and used by WED as a basis for the FWRR engines. In fact, I can tell you that Jerry Best himself was on hand for the design "research trip" that took place. 4 WED employees ventured to Kimball's house along with a studio van. There, they met Jerry who began to trim tree branches away from the engine stall where both his and Ward's Hawaiian locomotives were stored. Using block and tackle mounted to a railroad tie further up the roadbed, the Chole was the pulled out of the shed cold. Once clear, the Olomana was pulled to daylight as well.
Once accessible, both engines were heavily photographed in detail, many times with engineering scales included for later reference. Of particular interest to WED were the Olomana's petticoat and the Chole's crosshead.
Hope this helps settle the debate.