Sorry, but you would need to have rocks in your head to buy a nearly 30 year old 109A MKII with 2 Allison C20 engines for anything like that kind of money, or any money really.
These aircraft can be very unreliable, difficult (and expensive) to maintain with poor parts availability and if you are relying on it to earn a living, you will be on bread and water! I have seen companies buy a 109 as a corporate aircraft and pop champagne when they were sold. Most of these aircraft do <200 hours per year, factor that into how you might make a living with it.
Even though its too big, you could buy an S76A for $500k. Even S-76A++s are going to the scrapyard these days.
You need to buy something on which you can get a PBH contract and that is simple to own and cheap to maintain. Buy with your head, not your heart, think twice, think again, walk away and see what you can lease before buying any older aircraft.
Of course, you may just have loads of money and want a corporate aircraft, if so, charter when you need it and keep your money in the bank.