>> I'm not sure [...] that can you create an EXT partition with other than
>> MBR partition table... so it might be difficult to get such a partition
>> on your system HD which has a MAC/RDB partition table.

> If I have a 'fresh'/empty HDD then I could surely create a partition
> with a RDB structure using HDConfig

MBR is said above to be the partition table/map that will most likely be able to hold an ext2/ext3 partition. Of course, you may try with the one you prefer (MAC/APM or RDB), especially with internal drives, and see if that works.

> and then use Mounter to partition it as required, or convert it to an
> EXT2 or EXT3 filesystem! 8-)

Mounter isn't capable of partitioning drives or changing filesystems of partitions. It only does what it says on the tin: mounting existing partitions with the filesystem they're formatted with.
Partitioning and selecting filesystem for later formatting is done in HDConfig.