1. A .22lr is always a good weapon to have around. Are you dead sold on the Ruger 10/22? Perhaps just a personal preference but I would much rather have a much cheaper bolt action and spend less leaving me money for ammo or other toys.
Conversely, if you are thinking of a SHTF situation, you may want to take a look at the Henry AR-7. http://henryrepeating.com/rifle-survival-ar7.cfm
2. I would leave the shotty just as in. If anything, add a Buttstock shellholder w/pouch. Something like: http://www.amazon.com/Allen-Company-...s=shell+holder
3. Can't say anything against it because it was my idea.