Yes, I guess that's about right. The Prat engine dose not offer quite as much power in hot & high...on paper, but it is reliable power! Also do your sums re payload/range: how many pax - how far. If you fill the L/R tanks you will end up with a pilot and overnight bag and a lady passenger, not much more and don't believe what anyone tells you about empty weight, the published EW is before any "options" such as interior are included, sit down and look at the Weight & Balance. And there is a 109E for sale in Europe with NO AC, make sure it has an ECU!
30C HIGE about 2660Kg
30C HOGE about 2300Kg
One Engine Inoperative 2.5 min Power
Cat A WAT Limit (Clear Area) 30C MTOW about 1,000ft
40C MTOW about -350 ft
Cat A WAT Limit 15x15m Ground Based Helipad or 20 x 20m Elevated Helipad 30C MTOW about -300 ft
27C MTOW about SL
Depending on how you read the graphs
Fun Eh?