Here's a list of Peter Matkovich designs from his website.
Arabella Golf Club (Near Kleinmond, Western Cape, SA)
Borrowdale Brook (Zimbabwe)
Centurion Country Club (Centurion, Gauteng, SA)
Cotswold Downs (Hillcrest, KZN, SA)
De Zalze Golf Club (Stellenbosch, Western cape, SA)
Ebotse Golf & Country Estate (Benoni, Gauteng, SA)
Elements Private Golf Reserve (Near Bela Bela, Limpopo, SA)
Golf du Chateau (Mauritius)
Hermanus Golf Club (Hermanus, Western Cape, SA)
Kranspoort Golf Club (Mpumalanga, SA)
Leopard Park Golf Course (Mafikeng, North West, SA)
Leopard Rock (Zimbabwe)
Pinnacle Point Golf Club (Mossel Bay, Western Cape, SA)
Prince's Grant Golf Club (Near Stanger, KZN, SA)
San Lameer Country Club (Southbroom, KZN, SA)
Silver Lakes Country Club (Pretoria, Gauteng, SA)
Simbithi Country Club (Ballito, KZN, SA)
Steenberg Golf Club (Constantia, Cape Town, Western Cape, SA)
Umhlali Country Club (Ballito, KZN, SA)
Woodhill Country Club (Pretoria, Gauteng, SA)
Zebula Country Club (Near Bela Bela, Limpopo, SA)
The World of Golf - Practice Facility (Sandton, Gauteng, SA)
I've played a few of them Arabella, Centurion, Steenberg, Woodhill and used to practise at The World of Golf.
I don't recall them being overly narrow but wouldn't classify them as wide. San Lameer which I didn't play but drove by a few times has the reputation of being exceptionally narrow.
I just got the feeilng down there that golfers were seduced too much by conditoning, big name (ie Nicklaus and Player) and big money projects and that length, narrowness and difficulty were essential components of great golf courses. Most guys rated the Gary Player CC at Sun City as the best course which I thought was over rated and not great fun to play whereas I would look forward to playing Humewood every day of the week.