fiberglass quarters on 68 cuda?

anyone ever used these guys?would glass quarters be good on a mainly street driven car?can I handle installing these myself without a welder or experienced bodyperson?

Plymouth Barracuda Catalogue 1967-69 and 1970-74 - Fiberglass & Steel

Plymouth Barracuda Catalogue 1967-69 and 1970-74 - Fiberglass & Steel