It's difficult to get the rust blue/brown solutions up here.
Not many will ship it up from the US and if they do there is added fees that make it wicked expensive.
You can drive it across the border yourself (which is what I do), but again, unless you have some reason to be across the border (more than a bottle of LMF) it's just not worth the drive.
When I was building Ohio rifles, which historically didn't have the metal treated in any way (at least the ones that I tried to emulate had the wood finished, but the metal left "in the white"), in order to get kinda "greyish" finish that the metal takes on after 100 or 150 years of age, I simply applied a couple of coats of Birchwood Casey Perma Blue (which you can find all over).
As to your wood finish, you have tons of options. You can go with Minwax or Varathane, either oil or water based stains (again, most of the stains guys use on this site are not available for export due to shipping liquids etc etc) I often used the water based stains from Saman - available at Rona - you can mix them to come up with zillions of colours - so if you want "lighter walnut" then their light walnut, you can add a little extra white (or whatever).
Lee Valley does have a whole whack of aniline dyes in powder form that can be mixed with alcohol to try and mimic the old style violin red (or whatever you might like). I have played around with their "ruby" dye over top of aqua fortis treated maple (aqua fortis is another one of those items you pick up when you happen to be south of the border).
For your top coat you "can" get Tru-Oil (Sail stocks it) if you want to go that route. Other options would be spar varnish (super tough - used on wooden boats below the waterline, so more than enough for wet/snowy weather up here) or you can even go with "modern" polyurethanes (varathane diamond coat - exterior) etc.
So while you can appreciate the advice from most of the guys/gals here that toss around names like Aquafortis or LMF etc, we just can't get them up here and shipping them from the US is almost never an option.
If/when you make the pilgrimage to Dixon's one year for the Fair, bring a full wallet and take back a couple years supply of the "liquid stuff" that is near impossible to ship across the border - they don't care if you drive it, just nobody much want to carry it for you.