Yes Turnbull restorations are very well done,
to your points
#1 - assuming safe wall thickness - RST are as good as you will find. Polywad makes the "Vintager" shell which is another good low pressure 2 1/2 inch - off the shelf shells will likely be higher pressure. your chamber are most likely not 2 3/4 inch originally, but some were. By 1905 - smokless powder was in common use - but I personally stick to the low presure loads in damacus
#2 - not sure if you are in the USA - there is no standard proof house here. you can have it done at Birmingham England Proof house - not inexpensive, and you need an exporter to handle the transfer.
#3 - sure you can tube it - but if the barrels are good you don;t need to
#4 - look in the Hunting with Parkers forum for some pictures of other damascus DH's in action
as for care- its not much different than any good double - keep it clean and shoot it safely
we will certainly look forward to photos when you can share them. Join the PGA and get a letter on the gun- you can sometimes find some interesting history on the guns.
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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