Well, lets take the possibility of casting this in consideration. There are several things I would have to find out, and changes to make for it to be possible.
1. I would have to saw the griffon into bits, to make it physically possible to fit it in two part mold. This is of course not impossible, but I have not been sculpting the model with this in mind, so it might prove difficult on some parts.
2. The wings are from Games-Workshops Island of Blood griffon. I think that GW would mind, if I recast their wings. It is only legal here (Finland) to reproduce stuff for own personal use like that. So I would have to sculpt new wings. This is not at all impossible.
3. I would have to find a professional partner to do the mold and cast the models. I have done some casting myself, but I think that the quality would be much better if done by professional. I would not like to sell crap, you see
I live in Finland, and... well shipping this thing to US (for example) might be a little tedious.
4. I have a job, that pays well enough. I don't want to start a business to sell the figures. I like to keep my hobbies... well, as hobbies