Are there specific 'Namibian' vowel sounds I should be worried about?

I’m focusing heavily on my accent and recording myself daily, but I’ve noticed some vowels in my listening practice sound much longer or 'thicker' than what I hear in standard Gauteng Afrikaans. Is there a guide for Namibian Afrikaans pronunciation, or should I just stick to the standard model until I’m more comfortable? I don't want to pick up habits that make me sound unintelligible to native speakers.