ibook Clamshell i7/i9 core project

Hi! 

I am planning on upgrading an ibook clamshell in order to use it properly in 2019.

I know this is a larger project, but this is the first time I am doing something like this, so I was hoping for some support from others who have a bit more knowledge in the field. 

Any help would be much appreciated!

I already own a tangerine iBook G3 Clamshell, it doesn’t have a battery so I always have to plug it in. I know you put in a more modern battery to power the newer internals. I know newer batteries have a different shape compared to the original Clamshell one, so where do you put it? 

Also I know that you need to modify the charging cable as well in order to charger the newer battery, does anyone know how to do that that?  

Regarding a new Motherboard, ram cards, hard drive, etc. do you purchase all of these components separately? If so is there anything I need to look-out for regarding compatibility or are there any you recommend? Another thought I had, would be to purchase a defective Macbook Pro (2015 or newer) online and “steal” those components to put into the Clamshell. Do you think that would work? I would feel more comfortable knowing all the components are compatible.

I heard people talk about “gutting” a macbook air for this project. I am assuming a macbook air is handy due to it’s slimness and size, but I would prefer to make the clamshell as strong as possible so would a macbook pro 13 inch work too?

Thanks for the help!