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Marc,
You need to look at several things on the possible donor gun to determine if it's suitable for converting to the caliber you want to build. Some things that are positive factors are if it is a fairly modern gun with good steel in it. Steel has improved quite a bit, even since the 1940's.
Does the gun's frame lock up tight and does it have a third fastener on it such as a Greener crossbolt or a sliding Purdy hidden fastener? How closely do the firing pins fit into their holes in the breech face and how large are the pins in diameter? Sideclips do help a bit to stiffen things up if they are fitted tightly plus they may help direct hot gases away from your face in the case of a ruptured primer.
If you intend to reuse the original stock, is it going to be strong enough to hold up to the recoil of the new cartridge? If you measure the diameter of the barrels at the front of the intended monoblock, is there going to be enough diameter to allow for having a good shoulder plus enough barrel diameter to contain the pressure of the new shell? Have you picked out a caliber that gives you good ballistics without going overboard on pressure?
I don't know anything about the brand of gun you asked about, but if you are going to be the person who does the conversion, these are some of the things you need to look for and then decide for yourself, whether or not you feel it will hold up. Your choice of load makes a great deal of difference also, but if you decide to use a reduced load however, for God's sake, mark that load on the gun in a prominent location for future users to see. Bob

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