NOOOO don't take any notice of those schematics - they are from the Star Trek Factfiles, which to be blunt was rather lacking on facts...
The war necelles are the 'wings' - the yellow glows are the associated plasma etc so instead of necelles they are housed in the main body of the craft - something akin to Defiant and Klink BoP's.
Sensors - thats tricky - theres nothing really to go on but personally I would go with the areas where there are recesses with darker lumpy areas in - such as the 'trench' around the saucer/stardrive of the Enterprise D as redone for Generations, and the sensor pallets on Voyager. The Galor seems to have a few of these dotted about in areas that would make sense for such a set up.
Weapon points are obvious - not just the 2 main arrays but also small cuboid-pyramid extrusions dotted about the spaceframe (Cardies appear to have powerful main arrays and lower power arrays for defence - unlike Federation where weapons power is more evenly distributed - defensive philosophy versus offensive if you like).
Don't get me wrong I love the Fact Files, but they really cocked up in regards to the ships in many cases (poor information, mishapen schematics of ships etc). Just go with what makes sense - would be more reliable than those schematics I'd say!