Thanks guys! Here's an update... it's quite picture heavy so forgive me in advance for such a lengthy post. I'll try to remember to post less pictures more frequently.
Before diving into the cowling installation, I painted up the propeller. It was weathered using different colored pencils keeping mind that the prop blades were wooden and not metal. I still need to figure out a good way of masking the spinner spiral in case the kit decal doesn't go on well.
Ok... deep breath... on to the installation of the three engine cowling pieces. Like I said previously, after pre-fitting I've decided to glue the side cowlings first and then the top cowling. The starboard side seemed to be best fitting so I started with that piece. I used Tamiya Extra Thin cement and tried to press a solid bond at all of the connection joints.
Once the starboard cowling piece was set in place and the glue allowed to dry, I secured the port cowling. Fit started to go astray at this point. I had to treat each joint separately, first securing the cowling to the fuselage side connection and allowing the glue to set before gluing the bottom, which didn't want to align.
But the bottom connection came together with some finger pressure and glue.
I set that aside and allowed the glue to dry for several hours before trying to get the top cowling piece on. Again I treated each joint separately. The port side seemed to be the best fit so I secured that with TET first.
You can see the other side not wanting to settle down but I left it like this while the port joint dried.
After a few unsuccessful attempts to secure the starboard edge with TET, I resorted to CA glue and brute force to close the joint as best as I could. The horizontal gap above and to the left of the supercharger intake was large enough to warrant a shim but I couldn't catch that during pre-fitting.
So I resorted to using White Milliput forced into the gaps and then cleaned off using a damp paper towel. This is a good way to fill gaps at existing panel lines because it requires no sanding. This technique was used all over the aircraft smooth out the modular joints.
After the Milliput dried, I sprayed the seams with Mr Surfacer 1000 thinned with lacquer thinner.
I'm not out of the woods yet. The joints so far aren't great but manageable and I can start touching them up. But there might be some issues with the fit of the nose cowling assembly. Hopefully, I can successfully cross that hurdle when it comes.