I want to become a BIOS modder

[Sml6397]

Manufacturer: Sony
Notebook Model: VAIO VGN-N250E/b
Motherboard Model: MBX-160 MS71 Rev: 1.1
BIOS Revision: R0070J4
BIOS Type: Phoenix BIOS
BIOS Download Link:
[attachment=5585] <- Confirmed flashable R0070J4 BIOS image
[attachment=5586] <- Modded(IntelMenu).ROM

RW Everything Report Download Link: [attachment=5587] <- (I had to put the ".doc" extension on the end of the file name, because the site wouldn't let me upload it, just remove the ".doc".)

I want to modify my own BIOS (to add options/menus) and eventually participate in the BIOS modding community. I have already succeeded in enabling/disabling features (AHCI, VT-x, Service/Repair Mode, Phoenix Info Screen, adding items to boot menu, etc.) using the NVRAM registers. In PBE and HxD (Hex editor), I have succeeded in adding a hidden Intel menu and placing options in menus of my choice (I used PBE as an emulator). I have learned to find token IDs' function(s) by tracing strings to their respective token id's in TEMPLAT0.ROM.

The problems I am having are as follows:
1.) I need a guide on how to create a flashable BIOS dump. EDIT: I have created my own CONFIRMED WORKING flashable BIOS image using platform data from a WORKING R0030J4 BIOS image. I am going to re-upload it in place of the previous bios dump.
2.) I have read about PBE causing problems when extracting and/or repacking the BIOS. How can I safely (as possible) unpack and repack my BIOS? EDIT: Problem answered, now I am having trouble repacking the image with PhoenixTool (4 bytes too big).

I know that I am asking for a lot, but this will allow me to start modding BIOS's. Any help is highly appreciated. Thank-you.