Each XML file encapsulates the hilimit, venter, fsensor, etc...attributes for each possible expected value of the "manual" variable.
Now as for how to avoid having to type in all those part numbers and prices and such. . .I don't know how to help you there unless you already have that stuff existing in digital format. If you do have it in an existing digital format it should be pretty simple for a programmer of novice to intermediate skill level to write some kind of a utility to parse it automatically and produce the output in the desired format.
EDIT: Another possibility, if you are comfortable with XSLT, would be to link directly to each XML file and let the web browser parse it and display it using a given XSLT stylesheet. If you have no idea what XSLT is and have no desire whatsoever to have to learn yet another "language" then you could just stick to something along the lines of what I already proposed using AJAX.