As I do the mundane fillets, I'm also working on the accent do-dads for this beast. Aside for the panels and drive vane covers there are two other prominent sets of whats-its on a V2. Those are marked in G. Harry Stein's drawings as "Pullaway Plugs" and "Turbine Vents", and can be seen in a few different looks here:
The Turbine Vents are rather easy. That just required cutting some 38 mm blue tube coupler at a 45 deg (boat tail) angle, and then a 22.5 deg cut of part of about 1/2 of the circle. This was a complete failure with power tools, so a hand miter box was used. The only challenge was to keep the tube from rolling between cuts, so it was taped to a little jig I made for holding tubes for drilling...worked fine.
The Pullaway Plugs were a bit more challenging. For these I order a balsa nose cone (BNC-60OR) from Semroc (eRockets). Aside: I love that there will be a balsa nose cone on my L3 project...this amuses me to no end. I split it by eye with a Zona Saw and box cutter (because the saw was too short). Then I removed the shoulder and match sanded the two halves.
To get the shape generally right I knocked them down with the sanding bar, and smoothed out the shape with some gentle hand sanding.
To get the contour correct for the boat tail I taped some sandpaper to the boattail, and carefully sanded the contour into the underside of the do-dads. They didn't come out perfect, but well within spec.
To give you an idea of how they fit:
Both do-dads are a bit large relative to scale, but again, I plead sport scale. In actuality these pieces appear to have changed size quite a bit in the many versions, particularly among the early examples. I will need to harden up the balsa parts with some CA, polish, CA, polish, fill, CA... cycles, but I'm pretty happy with them. They should also be pretty well protected on landings as they are well inside the "fin valley" if that makes sense.
As a bonus, all of these accent bits weigh almost nothing, and should provide some drag at the correct end. I doubt it would influence the CP much, but if it does it will certainly be to pull it aft.