Over time if he can make it it's definitely worth it, depends how much zeny he wants to make for the knight anyhow, but probably not so much on short term plan. Buying chains to overupgrade, buying the 3 peco egg cards, not only is it costly, but you also need to actually have someone selling them.
So if it was up to me, I'd make it a side project you know, when you see either chain/ppe card not too expensive you buy it and put it in storage until ready to assemble it.
