I'd be awfully surprised if there's anything on the 99 in electronic form, unless maybe Ameriflight produced something. The stuff you have for the 100 should be ballpark-accurate if you delete the pressurization. It's Fred Flintstone simple... I wouldn't worry too much about systems and such. And it's tied with the PC-12 for the easiest, most forgiving plane I've flown in terms of "stick n rudder" stuff (and significantly more "fun" to fly...better balance, good roll rate, etc). It's like a big baron with engines you can't shock cool. It's really not a bad airplane if it's flown on the missions it was intended for...more like extremely irritating.