Seevers will do them as a homer, i would but forget how to use my tools!!!
Easy enough to make tbh,bottom,top and mid rail, 2 braces (diaganol)and fit the planks.
Mind and use crook and band hinges as TEE hinges are guff.
Any more help just ask.
(joiner to trade)
PS i have forgotten more than seevers has learnt!!![]
davie