FSC requirements add special problems to our fabrication process. We can make prototypes in non-FSC material.
For instance, we have all thickness in white oak that is not FSC that has been drying for up to 5 years so that when a request comes in for thick parts in white oak, we will have it to work with. We have to buy our thick white oak years before our customer asks for parts. Adding FSC to the requirement makes it almost impossible to have stock when needed.
The problem with FSC for a wood bender is that our wood has to be purchased green, and dried to about 20% moisture content for our extreme bending. After bending, the wood is dried the rest of the way to fix the shape permanently. All FSC lumber is sold kiln dried, because there is no volume market for green FSC lumber. Only very large mills who work with FSC sourcing produce lumber from it. Those mills only want to work in very large volume. So finding FSC lumber to buy green, is challenging, but not impossible. It just takes time to source, then time to dry.
Kiln dried lumber can't be used for bending. We can usually source fresh sawn green FSC lumber, but it takes time to find a mill that will separate the stock from that going into a kiln. And then it takes more time for us to pre-dry the fresh, green lumber to 20%, especially for Oak. Oak must be dried very slowly (months for thin stock to years for thick stock) to avoid checks. Most of our customers will drop the FSC requirement when they understand that for extreme wood bending, FSC causes a delay of a year or two to develop a supply for the customer. If we are going to do it at all, we would recommend that the part be made of three layers of ~25mm stock, which can be dried more quickly (months instead of years).
The quickest way to make thick bent parts from FSC lumber is to laminate thinner strips of the dried wood. We could do this for you. Strips of about 6mm could be bent for your part, and laminated together to form a thick part. Glue lines will be present, but not obvious. We call this a "steam lam". The parts are steamed for bending, and the dried FSC lumber will bend enough, if they are thin enough.
Unfortunately, FSC requirements are written into specifications for parts without the specifier understanding that in makes it almost impossible to find a fabricator to bent solid parts to that specification, especially in white oak.