stick them in place with tap. then drill the body underneath where all the holes already are in the skirts, then stick some selftappers in, with spacers on them to spread the weight of them so the skirts dont split around them, you wont be able to see them so its fine, and do the same for the endcap. then just stick 1 or 2 self tappers in the end, and do them the same color as the skirts to try disguise the a bit