I'll add that, once you start playing around with the above modules, you'll quickly see how important it is to have something like the 3x MIA...unless you plan on slamming every signal thru at full strength, attenuation is key.
I also question the need for a scope. Exact same reasoning as Wishbone provided. I had a small scope and it just didn't add much value for the space/money. Ears are better. But full-sized euro scopes are too rich for my blood.
Other than that, it looks pretty good, and with a Mantis case you'll have some room to maneuver.
After jamming with that setup a bit, you'll quickly see what you're missing...(which will be different for each person, that's the joy of modular!)
Your initial set of modules is enough to get you off to a good start. Best luck and fun! :)
“You must have chaos within you to give birth to a dancing star.”
― Friedrich Nietzsche