OK, I don't know what the time committment is to making all this stuff, so I can't judge what it is worth to do it or not. You could do it and consider it a gift you are giving to your husband, really, since it is important to him. Is he worth the time?
Frankly, I find it SUPREMELY annoying when I am expected to do all the gift giving/ making/ buying etc, and all he can do is disagree with my choices. For Christmas this all falls on me, even though neither I nor my family is Christian but my DH and his family are. He does not help in any way. I quilt, draw, knit, shop, everything! If he disagrees with anything I do for another person, especially if it is HIS family, I say, "OK, you're welcome to make/ buy what you want for them. But if I am have to do it, this is what I am going to do." He stops pretty quickly there because he doesn't actually care enough to do it himself. I've told him how annoying that is, and I think he gets it. :)
So, either do it or invite him to. Remember in the end, though, that it might become a sticky point more in your marriage than your relationship with SIL. What is that worth to you?