QRV since 1993.
Via mouser.com the C's, enclosure and RF connectors can be ordered. For the coils you have to find out what kind of copper wire or tube is available locally. With the coil calculator program it can be determined if the wire and/or tubing is useful.
In our filters we use ATC800C capacitors, but those are hard to find in small amounts. You can buy Cornell Dubilier capacitors with almost the same specs via Mouser.
Download the XLS file for the needed part numbers. Double check all the capacitors values vs drawings!