I personally would not. The Valmet series guns are collector items. While everyone would like to have Valmet magazines aplenty, the reality is no one really is using the Valmet for anything other than collection purposes. An after market mag like the LIQ mags of the 1980's will not enhance the collector value.
For the 5.56 Valmet rifles, the Galil magazines and some 5.56 pattern eastern European AK magazines can be modified to work without setting back the bullet and cost around 50-70 per mag with professional shop modification and re-finish.
308. Galil rifles are quite rare and I would be surprised if there was any market in the US for aftermarket magazine in the $200 price range.
Years ago, I looked into importing Valmet magazines from FIN. The tooling has long ago been sold off or reused.
I applaud your gumption and don't intend to be a Debbie downer, just stating my thoughts on the subject.
I would point out that a few years ago, someone on the boards made some printed magazines, I received one of the magazines and it lasted 11 or so rounds on my NFA M76 before the locking tab broke off and the feed lip cracked. I do applaud that board members attempt as well. Reliable magazines are not easily designed or made.
18Z50