Re: couple mounted salmon flies
If there are any cabinet shops around you (or moulding shops) you could take that block into them and ask them to fabricate them for you... it appears to be 1" thick by 4" wide oak, routed quarter round on the ends, then a dado blade used to cut the groove.
These could be hand sanded, stained and spray finished. Just make sure you take in one plexi holder so they can get the groove right.
If they took a solid plank, they could quarter round the entire piece lengthwise, use a jig to setup the saw for the grooves, then slice them off assembly line style- at 3" wide, you'd get 20+ of them out of a 6' length of wood =)