I am a very experienced scala engineer with extensive expertise in play! I use develop in Scala daily an have been using play since its infancy. Depending on the long term goal for this project and your scala knowledge i am happy to do this in play. 2.5.2 with DI or the older and more documented versions.
ALso, i put 5 days for the time because there is no indication of the size of this script. That is, is it a script or an application? with db access, tests, etc? With more information i can give a more realistic estimate.