Unless you want to spend around the exact same amount of money as it costs to buy a brand new, perfectly serviceable pedersoli rolling block I'd advise against, unless you want something special that is.
My own started as an 8mm swede roller from trade ex 400 bucks I believe (was in almost new shape). 150 bucks for a 40 cal octogon barrel, 110 bucks for a 40-60 Maynard reamer, 80 dollars for the ch4d dies, 20 bucks for the headspace gauge and 150 bucks for the wood. MVA sights were 450 bucks I believe. I did the machining myself but a friend did the stock and it turned out pretty nice. You have to be able to duplicate the square thread and need a milling machine for the radius at the bottom of the barrel to clear the rolling block, and weld and extension onto the extractor.
It shot well, but it still had the old military trigger and changing the spring helped a lot. I was never satisfied with it because frankly, I have a Shiloh sharps with a DST and that swede roller would never hold a candle to it. The stock on the roller wasn't that pleasing to the eye due to the drop at the wrist and it was straight, I wish I tried bending the trigger guard into a pistol grip, it would have made a huge difference in looks and handling. Also wish I milled flats onto the receiver ring but it was pretty thin as it was.
And in the end, I went back to the 45-70 Shiloh. pedersoli makes the John bodine with DST that frankly comes very close in price if you put a value on your time at half of minimum wage. If I were to do it again I'd start with a martini enfield action, keep the same caliber or go 40-70 SS, get a pistol grip stock blank from Treebone and have something that's easier to stock, fit a barrel to, better trigger and looks different like the Peabody "What Cheer".
Yeah I know it doesn't have a hammer, but if it's just a range toy who cares?
Would really like to tinker with a high wall action, but their cost prohibits that.
I saw probably a dozen such roller conversions at a gun show a year later, some better some worse, that were being sold for 6-800 bucks. I should have just tinkered with one of those. In the end you put a lot of money into something that frankly leaves a lot to be desired unless you put considerable money into it, especially now if your buying your trimmings from the states (I did this with the dollar at par) And pedersoli makes very nice rolling blocks.
Only roller conservation I would consider again would be a Remington #5 action with a new 7mm barrel or maybe a 303 tube. Do it up with a lighter weight octagon barrel 24 inches and an A5 scope to make a sharp little hunting rifle. I have the gun for it but it wears it's full military dress and came with the bayonet and it's almost a shame to mess with it.
