I don't think the purpose of this is to actually have the tools, it's to go through the mental process of creating them. Similarly, writing compilers in Scheme

I don't think the purpose of this is to actually have the tools, it's to go through the mental process of creating them. Similarly, writing compilers in Scheme for every language under the sun may not be the best way to get to produce production strength compilers, but it's a great way to learn languages.