Toby,
Don't get too discouraged with the decal situation, at least your have the logo on the fuselage, the rest can be "scavenged" from spares or similar A/M Sets. I swear, the first thing I do on opening a Roden Kit for the first time is fling the decals into the nearest garbage receptacle! I don't understand why they've had this problem since "day one", their Kits are very decent but I've found the decals really are a waste of space!
Like you I'm finding this one a bit of a challenge, if I finish the cockpit module this week I think I'll shift back to the Hansa Brandenberg W.12 Build I have going in parallel, if only for a change of pace.
Keep up the great work!
Cheers,
Lance