Mekanism is included as endgame content but requires access to the end to get into. (some ways around this if you get creative)

Otherwise the mod is mostly kitchen sink and all the changes are for compatibility between the included mods.

The goal for this modpack is to have minimal overlap in mod functionality (we don't need 12 electric furnaces in one modpack).

Currently the modpack is at version 0.9 my immediate concerns for 1.0 are:

Fixing the missing recipes for creates mechanical crafting caused by crafttweaker overwriting
Modify the botanita orechid pallate
Modfiy monster drops
Add more materials to silentgear
Make this page look less like my todo list

Long term goals for later versions will be (likely needing mods that don't exist yet, or just a lot of work):

Less overlap between create and immersive engineering (windmills, waterwheels and conveyor belts)
Lost Cities generation on default world
Some more reasons to explore the world
Quest book offering entry points and interactions between mods

Additional Notes:

Lost Cities gen needs to be added on world creation, would suggest using the "rarecities" profile for the feel I'm trying to get for the pack
Optifine seems to be compatible with this modpack in my playthroughs
FTBChunks is in this pack for all your chunkloading needs
Immersive portals is installed for seamless nether and end travel
You can craft a complete akashic tome out of a book
Have a great day :)

Theorycraft