@telmoleal looks like people that have done this are using drives like a Kingspec KSD-PA25.1-032ms Storage capacity of the drive may be an issue and it looks like you can get them [https://www.amazon.com/KingSpec-2-5-inch-Solid-SM2236-Controller/dp/B008RVN97A?th=1|on here] I cannot vouch for the quality of this part since I never purchased it or from this seller. Just an option for you to look at.
[https://68kmla.org/bb/index.php?threads/recommended-ssd-ide-solutions-for-g3-ibooks.42846/|Here is] some interesting read as well.