Thanks again everyone. With some primer drying on my 109, I turned to my Arado and fixed up the areas noted above and started on the decals. The hatch on the spine was also masked and painted. Though there was a decal provided for this, I decided to mix up a tan colour (the kit decal was a desert yellow) and shoot that on. I'm not sure why this panel was in the lighter colour but pics definitely confirm that this was the case.
As mentioned at the start of this build, I was not sure that the aircraft depicted by the kit decals had a single-colour scheme or a two-colour splinter scheme. To remove all doubt, I decided to go with the well-photographed 7R+HK which definitely had the splinter scheme. For this, I did have some decal options from my stash but both involved some custom cutting. One set had a white outline and the other set was slightly too large. I chose to go with the option of trimming the white off the later set, given that one of the H's was going on a white background anyway.
As it turned out, these old decals were getting a bit brittle and, despite using a new scalpel blade, there was some tearing along some of the edges. The decal also broke in two when I applied it and there was a fair amount of jostling to get it to the position shown below, which is slightly off the center of the white band. I'm not 100% satisfied with this but at this point I will need to accept it.
The kit decals are nicely printed and here's the squadron shield for 2/SAGr 125. The decal is applied over a recessed hand hold so, as you can see, it conformed nicely with setting solution. The close-up also reveals some overspray form the underside touch up painting that I'll need to remove. You can also see the unevenness of the gloss coat as the brush marks are evident. I'm confident though that a matte coat will hide this finish.
I have yet to locate some swastikas of the right size as none were provided with the kit. I alos need to do something about the W. Nr. which is stated to be 210 in some photo captions. More digging through the stash......