I want to design a modpack kinda like Regrowth, where Botania is the main focus, though there is some tech. One twist: generators from other mods won't be effective, producing little to no power. The only way to get lots of RF would be through Botania's Mana Fluxfield block. Or, perhaps, the generators could take Botania items in their recipies, such as runes or elementium.
The mods will play together more than a regular pack. Railcraft can be used to transport large amounts of mana, via mana carts. The mana can be used to make vis for Thaumcraft through Forbidden Magic, and Applied Energistics will have the Thaumic energistics addon to store essentia. Thermal Dynamics will be missing, in preference of Buildcraft and Logistics Pipes (once the latter updates). Ender IO will replace Thermal Expansion simply for the ender rail, which, combined with Railcraft, will be a replacement for the tesseract.
I was thinking of some possible builds, and came up with: Pump lava out of the Nether into tank carts > Ender rail to overworld > Unload to Arcane Spa from Thaumcraft > feed to thermalilies > split mana between storage and RF gen > fuel Dimensional Trancievers. With luck, some config changes, and some MineTweaker, this could actually be a way to gain RF.
Might have a quest book to get you on your way, but I haven't decided about that yet.