I just got Styria kit for bottom metal and AI mag. Couple of points that would make you think again:
Kit Price 430 euro - CAD$ 584
They don't accept any payment but Bank Wire, surcharge on bank wire is - CAD $30
On delivery import fees and taxes - CAD$140
Total payable CAD $754
Another magazine from Styria Euro 78 - 90, plus $30 for each wire transfer, plus import fees. They use IA magazines and you can get them locally, but the wont fit work right away. Styria says that "magazines require slight adjustment". The "manual" that comes with the kit says:
It is possible to use commercial AICS magazines #2 when the inner dimension of the magazine lips will be modified 10.5mm = 0.413". Attention: only the left magazine lip may be bendet.
Yes it says exactly this, word for word, yes it is "bendet". There is nothing else in the manual about magazine fitting.
When I put it together on my rifle first time, the bolt wont cycle as it hit the magazine lips (magazine or its lips sit too high). There are spacers specifically for that provided with the kit, so I put them in, the bolt went over the magazine just fine. However the cartridge leaving the magazine went too low and the tip of the bullet hit the bottom of the barrel before it can get up to the chamber. (resulting in a total lock up of an action by the way, because you can't get the round back as extractor didn't engage yet, you can't drop the magazine as the cartridge is still half way in the lips and the ejection port is too small for you fingers to get in, so you need a screwdriver or other tool to slide the round back into the magazine, even with a tool it won't slide back easily). So after several tries I now have a combination of spacers which allow me to cycle, but I have to be blunt - it seems that right now it will only cycle FMJ or pointed bullets, and flat nose will stuck I don't have variety of ammo at hand, but from the looks of it, the bullet tip misses the barrel wall by hair. YET, with these spacers in, the bolt will grind over the magazine lips if I put any pressure on the magazine from below (say you rest the rifle on something, or hold it by magazine). So it seems to me that if I want make it right I need to file down magazine lips which I don't have time and courage to do at the moment.
Other than that and the cost of a new Tikka you very well may like the change from crap plastic to all steel )