You can, of course. Just keep in mind that most people love seeing changes fast. If you create a sub and have to run it for a long time, looking at yourself every day to see if something is happening, you may get annoyed with the sub and think it isn’t working.
But if you put the physical changes in with other stuff, you can happily see the other stuff manifest in your life while the physical changes creep up on you in the background. Makes it easier to be patient.
I’m guessing that’s the idea behind Fire’s suggestion.
Of course, you could stack it as well, provided you can handle 2+ customs in a stack at Q+ level.
Men all over the world don’t care if it’s straight as long as they have hair again. 
I find it remarkable modern science still hasn’t figured out how to unclog and reactive those hair follicles.
These same men that want their hair back are also very envious of anybody that has trouble gaining weight of any kind.
I remember my teens. The joy of being able to eat a full plate of pasta for lunch and still maintaining my six-pack.
You should try it, guilt-free eating…
Other than that, Saint gave you the answer, eFit adapts even to ectomorphs. Be careful not to overdo it.
It is, but it’s a lot of sub. So be mindful, check in with yourself to see how it feels. If your foundation is inadequate it may lead to more reconciliation and take longer to show good results compared to going through the previous stages first.
That was the case with Khan and EoG, not with the later multi’s if I’m not mistaken. And even with Khan & EoG some people stacked St1 & St4 in a loop because they wanted both. Or went back to St1 for a bit.
It gets better/easier over time of course. But don’t be surprised if there’s a lot more healing than you think there is. Healing tends to work backwards in time, starting with the newest “issues” and working its way back all the way to times you can’t even remember anymore. Saint has been doing subs for years and he’s still coming up with new healing subs that knock him on his backside.
So feel free to combine something like I AM within your sub. I know I probably will.
I AM (Fire) + Februus (Water) =
Loving it already!
You should get an email with a message stating your subliminal has processed and is ready for download. The mail may have changed slightly now that the store is ready, but there should still be an email.
Second person to ask that. I can only guess but I think the other subs are causing it to happen indirectly. They invoke a change, the change has to possibly work on the genetic level. Maybe this module approaches the change in the other direction.
If that is a correct guess, then it would be great in any physical change sub.
You don’t have to include cores. Most people do since they contain a lot of stuff they can then build on with the other modules. So it’s probably a good idea to help give your subliminal some clear direction. But it’s not required.
Phew! Time to rest my hands.