Thanks guys for all of your comments - you kind of echo my own thoughts!!
Both donor actions will most probably be brand new - a Super Grade in 30.06 and a Safari Express .375 H&H out of the FN factory, so no issues with iron sights, just the extractor cut out, and the 30.06 will be rechambered to .300 H&H anyway.
Obviously the ideal solution would be to put custom barrels on both (definitely happen in the long term) but just exploring the feasibility of making use of the super grade barrel as a means of getting the .300 H&H sooner/in time for a planned trip to Namibia in 2017.
I may end up just taking the 30.06 (plenty of gun for my trophy shopping list) and adding a couple more trophies to the trip!!
I'll sound out the gunsmith and let you all know his response (I anticipate a lot of tooth sucking!!)
Happy hunting!
Stoats Tail.
