Fish: Harry is 100% right as for the cracks and the colored epoxy. As i was cutting mine to a (close to) finial shape i ran into a couple of caverns also, hell that burl. I stopped and filled em in and let hardened up and then made other cuts, and as the blank got closer to finial size i actually got to wood that wasnt a problem. It is not concidered bad practis to fill in burl with epoxy, in fact most will have an issue here and there, its common in that type of wood! I would use the epoxy that has a more liquid type texture to it and let it run as deep as it can, means you have to stand over it and watch the air bubbles come up and add more until it wont take anymore or it flashes over on ya! Unless the wood has a lot of warpage or shrunken spots in it, from the pictures i cant see that there is any of that going on, it may be alright? In the buttstock i have one spot that has a pin hole that may need filled, i'll fill it first and may lose it anyway in the final shaping of the stock! (it's to size, but still in block form) I dont think an outside vender would spend the time to do this without $, but you may be able to do the outside, and still end up with a fair peice with minor filling latter. A good stockmaker should be able to work around some of it anyway. If its a fair size chunk to begin with, what is on the outside may not be on the inside, dont know untill you look. After all it is mother nature and yes she can be fooled!