Hi Pete,
If you want to build a post-war M5A1, there are a couple of options that are interesting in my opinion.
First, a Portugese in Angola, as you mentioned. There are a couple of photos on-line of Portugese Stuarts in Angola, se
http://algarvepress.net/fotos/3594_batalhaodundun.jpgXXX,http://www.prof2000.pt/users/secjeste/Arkidigi/Angola/Nambuangongo/02_Nambuangongo.jpgXXX an
http://www.cmjornal.xl.pt/noticia.aspx?contentid=A5C5DE7D-7966-44BF-BEE3-06872BFD3D56&channelid=00000019-0000-0000-0000-000000000019 . (Sorry about the long links, remove XXX.)
They were used by Batalhão de Cavalaria 1927.
Second, a British turretless Stuart gun tractor at Suez in 1956. These were in sand colour and carried a rack at the rear for ammunition. They towed 17 pdr A/Tk guns. Markings were British VRN and a white H on the side.
Third, French M5A1 in Indochina. The markings are not that different from 2DB in NW Europe.
Fourth, the Nationalist Chinese (Kuomintang) used M5A1 in the later stages of the Chinese civil war in 1949.
If you include the M8 MGC, the French used these in Algeria. I'm waiting for AFV Club to release an M8 for this.
HTH,
Erik L