Matt,
well, first, let me add to your references -
here is first page (of 4 or 5) from afv interiors
(links to continue on are on bottom of this page)
http://afvinteriors.hobbyvista.com/pz4/pz4a.html
next, as an inexperienced scratchbuilder how has once or
twice bitten off more than he can chew, let me make a few suggestions:
1) start w/ the basic & simple stuff.
some kind of storage container, rectangular looking box, etc.
think about what level of detail you want to do before you start.
if this is your first time, you might want to leave out a rivet or two.
if the observer can only see through the open hatch,
he is unlikely to notice that some of the detail (which cannot be seen)
is missing.
(this is strictly your call. some folks 'wire' the backs of 1/72 control panels
in airplane cockpits, then seal them up, never to be seen again.
if that makes you happy - let 'er rip! otherwise start w/ basic shapes, then improve on them)
2) make patterns using 3x5 card paper and figure out what shaped it will take
to create a 3D object like the one you are making.
when you get it right, you can apply it to styrene.
3) this should be #1, but if you have followd 1 & 2 you are still ok)
NEVER EVER permantly affix any thing to the model until it is complete,
and you are satisfied.
imagine my dismay as i spent who knows how much time and how many attempts
trying to make little propellers for the 1/32 Stuka dive sirens that were already CA'd
to the wheel pants !!!
eventually i got it, but mostly because i HAD to!
there is much more, but i am not an expert.
start small, proceed carefully, DO NOT glue yourself into a corner.
:-)
and have fun!
when you are not having fune, it is time for a break.
if you continue not to have fun, it is time to rethink the scope of your project.
good luck,
keep us posted.