Great stuff. Nice work on the bunny suits in particular. Technically speaking they are the Kreigspiel Australians but yes manufactured and sold by Eureka. Not quite as nice as the Kosta Heristinadis' ranges but still nice figures.
Try going over the Steyrs with Vallejo Field Grey, with maybe a little white added. That's a suitable greyish green colour. The new M113 refits have a different turret and the bucket's hull has been stretched, so there's now an extra roadwheel. Not an easy conversion so I'm sure nobody would object to you having the older version. Just be aware that the sand colour in the pattern tends to have a rather warm pinkish tone rather than buff in most cases.