Glad you are moving forward, Tyson. FWIW, here is a picture of a solid body with a cap - this is a LP and shows the routing from the switch in the upper bass bout to the electronic cavity. I'm ready to glue the cap on, once that is in place I'll carve the top and then route the pickup and neck cavities
Here is a similar guitar, also a LP but is "chambered" which means that the solid body is largely routed away. It makes the guitar much lighter and has an affect of the tone
This is a semi hollow body - more or less like an ES-335 altho most of them have the center block extending all the way to the end. The center block will hold the pickups, bridge and neck, the rest of the body is built sort of like an acoustic (kerfed lining on the rims). In this picture the top is glued on, that is the back next to the body
Yes, there are differences in the impedance of neck and bridge pickups - for humbuckers bridge are often around 9 Kohms and neck around 8, but check with the manufactures specs.
Edit to add an interesting observation - those three guitars all ended up the the same pickups in them, however they do have a difference in sound largely due to the air volume (or lack of) and resonance of the wood (or lack of).