I don’t see why the Tikka T3 action wouldn’t be a good option for a budget friendly custom build, for a .473” bolt face short action chambering anyway. Aftermarket stocks are available from manners, McMillan, grayboe and many other sources. For DBM options you have tikka factory plastic or the mountain tactical steel with factory polymer mags, the factory CTR metal and mags, or CDI or grayboe for AICS mags. Short, medium and long action bolt stops can be swapped between receivers, factory trigger is as good as a timney 510 IMO, bolt handles can be swapped at home, and by most accounts receivers don’t need any truing. But I can see why someone wouldn’t want the long action sized receiver for a .223 build.
