Retrofit Reel to Reel player as an amp

Tomorrow is Australia Day, and also the Hottest One Hundred hosted by tripleJ.
My niece is in the running to get on the list so we will be spending the day down at the the local park listening to the radio with a bunch of friends. Problem is I don't have a radio that is portable. I do however have a small radio for use with headphones and an amp I pulled out of a broken boom box and put in a box. So off to the tip I went looking for a set of speakers and came across this old reel 2 reel recorder.
The idea was to gut it and replace the insides with the amp and newly acquired speakers.