There is more work involved than I think you are imagining, but it is definitely within the capabilities of the SBC65EC and PT24E-ASM.
http://www.modtronix.com/products/sbc65ec/sbc65ecr3.pdf is the 16-page SBC65EC Data Sheet. Section 4 "Daughter Board Connectors" lists the signals between the SBC and the PT24E-ASM Proto Board.
http://www.modtronix.com/products/pt32e/pt24er1.pdf is the 4-page schematic/layout of the PT24E-ASM. You will need to spend time understanding both documents.
One option for your window switches is given on the first page of the PT24E-ASM document, labeled "8 Way DIP Switch - NOT ASSEMBLED". If you were to get and load those parts onto your PT24E-ASM, you would then be able to read the 8 DIP switches (or substitute window switches). The 74HC165N shown on the schematic is a shift register, and reading the 8 switches involves shifting them in a single bit at a time, similar to what my Java program does for the LED outputs -- It is not trivial. Maybe someone else has done this and posted software on the Forum somewhere that reads the switch shown in the schematic. I didn't look. You *can* do all the required operations from the SBC web pages, and in fact that is how I developed my Java program. It isn't practical for actual use though. For example, "set C0 to 0, then set C0 to 1" (2 manual operations using the web pages) puts an edge on it and does a single "shift". Many such operations are required to get all 8 bits. It is tedious for a human but easy for a program.
Sheet 2 of the PT24E-ASM shows the terminal blocks X1 and X2, with all pins being No Contact. You have to connect them to other signals that come from the SBC. Notice the signals from the SBC are labeled on the PT24E-ASM board itself, near the two connectors that the SBC mounts on.
If you wanted to avoid the shift register, some of the PIC I/O pins (RA0-RA5, RB0-RB7...) could be wired to the X1 and/or X2 terminal block using wires added to the PT24E-ASM board, and high/low levels put on them using pull-up resistors and window switches to ground. I am summarizing here, and assuming some digital design knowledge. Hopefully this just gives you an idea of a general path to be taken.