Alright, so last time I posted I had said something about posting pictures of what I had been doing... Well, time has passed and I did a little more, so I'll share the images.
First off, the problem from the last time, matching the MS-09 Chest piece with the back piece of the Tropen. Like I said, I did a couple of cuts from the chest piece and sanded down the edges until they were almost a perfect fit. Not the best work, especially in comparison with some of the pieces I've seen posted here, but it looks alright. For the pre-build I used sticky tac to get the pieces to hold together while I evaluated the work...

After that, I assembled what I had already build and it looked a lot like...

And of course, I built the arms, though I found out that it was a little difficult getting the shoulder piece peg to fit through the upper arm and into the polycap in the elbow. I put the head together also, but not very fond of it... If I get a chance or sum up the courage, I may end up modifying the head as well... needs those awesome tubes like the Zaku and Gouf have... just seems like it's missing something key. Anywho, here you go!

After I put together the arms, I figured that I would try using the Dom Tropen upper arm pieces and they worked out a bit better than the purple ones in the picture. I think I'm going to stick with the Tropen upper arms, fits better with the shoulder joint. Next thing to do is put the hands together, but unfortunately the poly cap for the Tropen doesn't fit in the wrist slot, so I am forced to use the Dom hands... which are ugly... I'll see if I have something else laying around the house. After I get the hands together then put together the shoulder, it's about time to get the clay out and start putting things together (unless I can get my hands on some pla-plate).
That should be all, hopefully I'll have a little more work done to it soon and I'll be posting it up for you to enjoy! Thanks for stopping by!