Mycroft, are you sure that you're not thinking of the 228. The 328 has plenty of room for hand bagage.
Ginger, as regards the jump-seat, it's always worth asking. The 328 actually has a very good jump seat and the view, being higher, is even better than the pilots seats. Unfortunately, Scotairways takes a very negative attitude to jump-seat rides. I know this because I fly for them and it's difficult even to get a mate on board!!
However, if you pick the right Captain you could be lucky. First Officers get very boring to talk to after a while (I'm an FO). Looking at the roster I fear you could be out of luck. It's the Dep Chief Pilot flying you over on Sunday, and a TRE/IRE flying you back on Monday. Give it a try on Monday.
Cheers