No, your mods shouldn't have any impact in M32GB. See below.

It should not have a side effect after M32GBinit.sh. Actually M32GBinit.sh doesn't touch it. It would not have any impact on stuff located in /home/opt (/opt).

The problem with moveroot.sh is that moveroot.sh uses the same file structure in /home as should be in any root file system - it puts files to (/home)/usr, (/home)/lib etc. Unfortunately, I can't change the files location in /home partition to something else because this directory structure is required to run Maemo 5 from this partition. The collision should be fixed in moveroot.sh.

So, you are safe from collision as long as you move files under /home/opt or /home/user - actually, any place besides /home/usr (not user !), /home/lib, /home/etc, /home/dev, /home/sys etc - see full list of directories in "/" (but I take a special care about /opt and /home).

This is a wrong sequence to reverse your previous steps.

After your past modification you have two choices now before applying M32GBinit.sh:

1) don't do any - it should work, see Q1. (I like this variant)

2) remove some packages in UBIFS to recover space and move that stuff back to UBIFS root file system -

rm /usr/share/nokia-maps
cp -a /home/opt/nokia-maps /usr/share/nokia-maps

rm /usr/share/microb-engine
cp -a /home/opt/microb-engine /usr/share/microb-engine

rm /usr/share/tutorial-applet
cp -a /home/opt/tutorial-applet /usr/share/tutorial-applet

rm /usr/share/locale
cp -a /opt/locale /usr/share/locale

... and immediately reboot.

I recommend command "cp -a" instead of "mv" here because I am not sure what [I]else]/I] is moved to that locations in your N900. The location like /opt/locale is pretty generic and some package may put some files to it during installation. It could be safe to keep a copy in that place some time.

But if you are sure you can use "mv" command.

This script may cause a problem if you already have directories /home/usr (not user!), /home/lib, /home/etc, /home/dev, /home/boot, /home/dev, /home/sys, /home/syspart, /home/root ... etc - see again "ls -l /" for full list. The only exclusion - /opt (/home/opt) and /home/user.

If you don't pay attention and run M32GBinit.sh - it removes that directories before copying (/home/usr, /home/etc, /home/lib etc) - and that may have impact on system. The restoration would be - reflash root and eMMC. Sorry, please pay attention. I will update the first post to indicate it.