Warf,
In my limited opinion (I have started a collection of unusual 45/70 guns, primarily bolts) it appears you would have three options. An Enfield,a Siamese Mauser or if money is no option have someone build you a custom action bolt gun. I own the first two and with kids, a wife, dog and house will likely never own the third.
Here are the pros and cons as I see them.
Enfield:
These conversions were done by Navy Arms (the Gibbs rifles were also done by Navy Arms as I understand it). These are relatively easy conversions requiring rebarreling, some some minor work on the bolt face and magazine. They are also probably the least expensive conversion due to the low cost of enfields compared to other options. The down side is that eveything I have read and in a response from Navy arms they recommend against hot rodding loads and actually suggest staying on the light (low pressure side).
Siamese Mauser:
These are very strong actions and I have heard stories of folks stoke them to unbelievable loads. Some I wouldn't want to be in the neighborhood when they touched them off. They have all the benefits for adding sights, scopes and such as a regular mauser does. They use an obsolete rimmed cartridge (that can be made out of 45-70 brass) so the dimensions are very similar so modification of the mag does not appear to be necessary (a plus), although you do need to open the bolt face slightly which is no biggy and of course rebarrel. Mine has a timney trigger, not sure if these are available for the enfield or not but it is a very nice addition. I do not see a downside to this conversion other than you are going to pay more for the base rifle/action.
Custom:
You are only limited by your checkbook!
Although I am sure it is possible and has been done before I have not heard of anyone converting a Springfield, other mausers, or other bolt guns to 45/70 as of this time. If someone stumbles across one I would love to hear about it.
I like the Siamese I have that is converted, it is solid and very well built. Mine has a longer heavy barrel on it so it is a joy to shoot from the bench (where I spend most of my time nowadays) and is extremely accurate. I was at the range a couple of weeks ago and after getting the sights dialed in I cloverleafed the last three shots just outside the X ring at 100yds. Now for most folks that may not be a feat but for 53 year old eyes requiring Trifocals and only using peep sights I was pleased.
One thing you need to remember is they all take a little tweaking. One of the common complaints with any of these rifles is failures to feed. This can usually be corrected by playing with differnt bullet configurations and your Overall cartridge/bullet length.
AND as you are aware I do have an Siamese (a very nice one) available. (sorry had to plug it in there)..
Hope this helps answer your questions and others that might feel they need a 45-70 Bolt Gun....
DonT
