I've included some excellent drawings by A L Bentley from Merrick's German Aircraft Interiors so you can see my main reference. I just checked ABE books and saw it at $38 in acceptable condition. It's worth every penny!
Here's a rundown of the modifications I've made so far to the kit.
The nose. The first inaccuracy I noticed upon opening the box was the shape of the nose. The kit part has a somewhat angular nose shaped very like that of the Hs 129. In profile, it should look like a fairly blunt-nosed thick cambered airfoil, e.g. NACA 2418. I made a drawing of the correct curve from references and printed it out in 1/72 scale, then cut a piece of sheet styrene to this shape. Next I cut the kit part in half and sandwiched the piece in between. The rest was puttying and sanding to produce a master. The images below show resin copies made from a two-piece RTV mold of the master, with a couple of kit parts installed. The obvious additions are the fronts of the jet engines, but I also cut off part of the landing gear door (discussed in Part 1) and made it a fixed part of the nose. This correction I made after molding the replacement nose, having noticed that the opening for the nose gear bay should be somewhat farther back. There are a bunch of these resin parts out there somewhere (hopefully in completed builds) as I was selling copies for a buck plus shipping back in '98.