hawthorn, victorian and "limited knowledge/experience without professional advice (no offence intended at all, I have only restumped one home ..... NEVER AGAIN) equals warning bells to me for the following reason:
You own a very high-value home, therefore prospective buyers will likely have the funds to commission a detailed property report. If they see what youre describing it could detract greatly from the value of the home. Not saying you intend to sell now, but this issue will only get bigger over the years.
Flooring Timber selection should be carefully thought through, for the same reasons, as buyers of these homes in this area are usually very particular.
Archicentre is located within a few K's of you and offers a very reasonably priced assessment of such things. In additon, there is Authentic Age
http://www.authenticage.com.au/
in Hawthorn, who are expert in the renovation of Period Homes.
Make sure you learn to lift the existing flooring correctly as it is likely to be 150mm by 22mm Baltic Pine or thicker........ it's being sold currently for $14 per metre at one of the big reno-warehouses in Port Melbourne...... floor lifters are available for hire.
There are quite a few books on this available I believe, though I dont have any.
hope this is at least a little helpful.