Hey, nice haul(s) C band ROCKS! You may want to replace that feed/lnb combination with a
LNBF so you don't need another piece of equipment running the polarity servo. and a GBox to move the dish - OR get the Titanium Satellite
ASC-1 which cane move the dish (with an actuator) AND operate the servo (all via the sat receivers remote)
For FTA dishes need to be larger than what's used for DSS. They should be nominally 90cm across although some can be received with a 70cm. (30 inch) modifying a DSS dish for FTA is 'experimenter territory' IMHO.
Should I get the fiberglass dish as well?
It's so close, I would. If you have the room, why not? Set one up for the CONUS satellites w/ linear polarity, the other for Atlantic satellites with circular C band is one possible arraignment Another is one moveable and the other stationary on a popular 'bird'. Maybe 'string test' it first. (Search forum for procedure)
FWIW: My 'farms'
Group Shot - & IIRR you need to make 10 posts before uploading images is enabled, then upload at will, we like pictures.