If you're lucky the frame might be built up of individual pieces of timber, you can build up harwood replacements to match the existing (I used Meranti on mine). Otherwise you might need to rout some or all of the "shape".
Use 2 part epoxy filler, like repair care or timberfix, to bed and join the new mouldings to the existing.
If you're buying all the above from scratch it may be more economic to use a carpenter.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local