You might want to look into the Sig LT-40 instead of the Senorita.

The LT-40 is basically an updated version - with a LOT less work involved. It also used many of the newer building techniques which makes the build go much faster (The Senorita was designed back in the 60's and has a LOT of sticks that must be cut to size by the builder)

Do a search for RCKen's LT-40 Build thread. You can use it as a guide as you build.