Of course there are like a billion different ways to make a storm window. Mine is intended to be done by just about anyone who can get there hands on the cheap tools I'm using. The final product will include a "tool list" as well as hints on material purchasing.
so,
1) measure the receptical a million times.
2) cut wood once
3) fit up pieces in window to make sure it will fit and then label location and direction
3.5) clean up tools in living room to make room for your storm window
4) make joint, I used a dowel joint jig seen here:
5) here are some pictures of making those joints
6) Do a test fit
7) Route the Rabbets on the horizontal pieces.
Fit it together and mark the edge of the verticle pieces for the rabbet
9)Route the verticle pieces
10) glue and clamp pieces
(coming soon... Chisel rabbet corners, sanding, measure and cut glass, putting in glazing points, test fit two, glazing putty application, making a seal, installation system.... two weeks later paint)
) this should go on the "reference" page . As I look at your process it is very similar to that which we didi for "interior storms" tho we used smaller scale stock to make them lighter to move in and out of the frames - and they didn't need to stand up to weather. So, for those interested in inside or out - this would be a good guide. 
making our interior storms.
