I'd buy it and sell-off what you don't need.
Approximate resale values:
gh2; $380
14-140; $300
100-300; $400
14 2.5; $160
20 1.7; $240
oly: 45 1.8; $230
Total = $1710
Subtract 10% for paypal and shipping and you are left with $1687, which puts $687 in your pocket today.
From a purely economic point of view, you should buy the kit. However, this isn't a "nice" thing to do for a variety of reasons, for example you are acting as a middle man to take profit from the seller and charge more to the buyer without really adding value. You can decide if that means anything to you.
But you might find that you like the µ43 system. The GH2 is a great video camera. If you don't take video, then sell the GH2 and get something with a modern sensor, such as E-PM2, E-PL5, E-PL7, E-M5, E-M10, E-M1, E-P5, GH3, GH4, GX-7, GM1, or the like. Any modern sensor will give you nearly-APS-C quality, IMO.
A lot of people make a big deal comparing 4/3 to APS-C, but I think of it more as a change in aspect ratio. APS-C is wider, but 4/3 is pretty much a 4:3 cutout of the APS-C 3:2. See this picture to illustrate the difference:
http://www2.gol.com/users/cjeastwd/temp/apsVS43rds.gif
I quite often prefer 4:3 anyway, so when you crop APS-C you end up with nearly 4/3. The sides don't matter much to me. I personally find that the difference in headroom compared to APS-C isn't that big. There is a difference, but it isn't an obstacle in most cases. The formats are very similar.
Use the O45/1.8 and you'll get better DOF control than most lenses can provide on APS-C. Plus the O45 costs $230, peanuts compared to equivalent lenses. The O45 also focuses extremely quickly, 99% accurately, and has very high IQ. Throw in the 20/1.7 and you have a competent system that costs very little.
Other systems can offer more, but nothing comes close for value. And the "more" you get with other systems tends to be fractionally better with significant tradeoffs in price, weight, size, and loss of focus accuracy.
So I'd suggest you buy it, keep the O45, keep the P20, sell off the rest, and buy a more modern sensor. An E-M5 can be bought for $400 lightly used and is a crazy bargain with good EVF, extremely good 5-Axis IBIS, WR, fast AF, very good sensitivity, etc. etc.