Fully encrypting a multiboot-installation with TrueCrypt/VeraCrypt is unfortunately not possible ATM.
Also, chainloading an ISO in GRUB is not working, so it's kind of complicated to get FDE (Full Disk Encryption) working in a multiboot single drive configuration.
Not much to say here. Basic install with all your desired settings. But wait with wireless, passwords, setup & stuff.
Just let it use 50%(?) of your available space and let it create its recovery volume.
TL;DR: 100MB /boot, 50% I followed the articles from the german Arch wiki here and here (first one is available in english, too).