After Athineos took apart his Aspis (as described here and here), it was of course necessary to reassemble it again.
The first step was to cover the naked wooden core with a soft brown leather. It is important to start with the back side of the shield to be able to attach the metal fittings before covering the front. The leather is simply glued to the wood, which is prepared by sanding it a bit. If you want to try it yourself, make sure to have a large enough piece of leather as the curvature of the bowl takes up more fabric than you initially think.
In addition to the shield surface, Athineos also enhanced the metal fittings somewhat. He embossed a pattern in the, before reattaching them to the wooden core.
The resulting back side of the shield is quite impressive in my book: