I hadn't seen the Modoro mod before - I've just had a quick look at it. Wow - 4 motors just for the drive, plus another for gearshift and a servo for steering! Add in two rechargeable battery packs (although I think he does say that one is optional) and the SBricks and I can see that it's not a cheap mod! It's good of the author to make the instructions available free though as he's clearly put a lot of work into it.
The mod looks interesting in that from a quick look, it seems he's rearranged the drivetrain so that even though the L motors are in front of the gearbox, they still drive the wheels through the gearbox. But I'm not clear if the F-N-R function has gone - the gearstick is still there but I can't see that it does anything? And although it was a bit 'clunky' in the official model, the paddle-shift gearchange was for me one of the interesting features that I think has also gone in this mod (to allow remote control of the gears). As I said above, I think compromises like this are necessary - you lose other things in order to gain the motorisation.
I wonder if Modoro got the servo steering to work any better than I did - he may have different gearing to my attempt, but unless I've missed something, if you gear it down to make it more powerful, you'd lose some of the steering lock (given that the servo motor only ever moves +/- 90 degrees).
Another thing I found surprising when I tried putting motors in the Porsche was that, even though it's such a large model, there's still not a lot of room to tuck everything away neatly once you start adding motors (especially 6!), remote receiver and battery(/ies). I removed the fake engine to hide the PF battery pack I was using, but I still ended up with the PF IR remotes very awkwardly placed behind the seats - it looks as if this mod also ends up with the battery packs clearly on display (and the SBricks in the footwell?). That's why in the end I reluctantly decided that - for me - it was better to leave the model closer to the original with its interesting features, rather than with the motors etc. But I know that's not everyone's aim which is why I phrased my post above the way I did.
I found the body removal mod in a Youtube video - the first of 2 from Hispabrick magazine: https://www.youtube.com/watch?v=HSuGya3HByU&t=843s The second one which talks about the error in the gear sequence is also worth a look: https://www.youtube.com/watch?v=nu6f6lBkMXY . They are also mentioned in the 4th post on page 1 of this thread from June last year.
Have fun!