Thanks for the link. Last time someone posted about those courses i started watching them, but i didn't went up to there.

My problem now is that this really made me want to start coding my own Lisp.

Thankfully chapter 4 demonstrates how to do just that! Want to make it lazy like Haskell? Syntax different from Scheme? You are limited only by your imagination. Round that off with the last chapter from Let Over Lambda and you can add in "or make it like Forth"!

One thing i wonder though: i first wanted to code that lisp in haskell (learning two languages in one), but i'm not quite sure it's such a good idea, now that i've learned about homoiconicity.

Any advice ?

You are one courageous individual. But you are not the only one. https://en.wikibooks.org/wiki/Write_Yourself_a_Scheme_in_48_... has got you covered.

absolutely fantastic ! Thanks

No, no, don't spoil the best part!