Hi, first you have to look deep into custom rom..
All rom has the same folder structure..
A rom is essentially a zip file signed with a java tool named signapk..
and put into your home directory. Hope you are using linux because all this tools are for linux.
You need also sun-java6-jdk installed..
To give that folder you can made a nandroid backup of acer stock rom and copy into pc..
You'll use only system.img and boot.img
To extract system.img use unyaffs
Put system.img keeped from nandroid backup into unyaffs folder and type this
your_home:~/unyaffs$ ./unyaffs system.img
This will extract system folder into unyaffs folder..
Now you can choose wich apk delete or add or edit
Look also at buil.prop. For beginning you can use original build.prop
After yours editing you have to create a zip file named like you want your new rom.
Then open this empty zip and put those folder: system, META-INF, boot.img
You can use META-INF folder picked-up from mine last Ginger_dmd rom, but pay attenction to delete CERT.RSA, CERT.SF, MANIFEST.MF
If you leave those files sign wont't work
For boot.img use mine, I don't know if will work that picked directly from nandroid backup :/
Look also at updater-script into META-INF/com/google/android/
This is the file that recovery use to flash rom, set permission and create symbolic link..
Please try to understand well updater-script.
To have superuser you have to add su, busybox and Superuser.apk
So keep Superuser.apk from mine rom and put into system/app/ folder and su and busybox into system/xbin/ folder
Really busybox isn't need by superuser, but it's used by updater-script so you must have it
Now you are ready to sign your zip file with a command like this
your_home:~/sign$ java -jar SignApk\\signapk.jar SignApk\\testkey.x509.pem SignApk\\testkey.pk8 ~/sign/your_rom.zip ~/sign/signed/your_rom.zip
Look into /sign/signed folder and you'll find yours new rom ready to flash
Note that you can add/delete all stuff to a normal folder and after put into zip file, or add/delete directly into zip file
Obviously you can try editing mine rom to understand the signing process and to see if it works
After that try wich you want and good luck
Hope this help you and anyone that want to play with custom rom