Iron Oxide, AKA RUST!!!

ok got a question about rust and frame rails... I have a little rust problem on my passenger front frame rail. I thought it was just on the outter were the bumper brackets mount when my welded nuts came off during disassembly... I purchased an outter frame rail patch to fix it and finally got around to doing this and found some rather disturbing stuff... (pictures below) i realized the bottom of the frame rail was also suffering from the cancer as well as the very front of the inside portion. my big problem is the amount of rust scales and flakes that came off along the inside of the rail behind my cut. I went back a decent bit from the visible rust on the outside but this is what i found... do i need to replace the whole thing or open it up further back the same way i did at the front and clean it out epoxy prime it? thanks for your help in advance!

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so just bite the bullet and replace that whole frame rail then?

thanks for the help guys. I wish there was a way to determine how much rust is on the inside of the frame rail since the outside doesnt look bad but it is pretty eaten up on the inside on this one. i have a little rust on the floor pans that needs to be addressed as well as a few small patches on the doors and quarters and b post area... guess i need to get to stripping and cutting out and burning in the new...

so i have decided a couple things about this situation:

first i am going to replace the frame rail a the least if not both depending on need.

second i want to media blast the rest of the car

so this brings some questions to mind,

in putting the car on a dolley/ frame rotissery type contraption to do the blasting on where should i attach it to the car so i wont have to remove it and all when it comes time to replace the frame rail and other rusty spots?

i am looking at different media types, plastic, walnut shell, and a number of other options, what is best for the buck and what grit is prefered for this particular application? suppliers? any other help you might can offer in this, since this will be a lot of engine bay under side, and interior so chemical strippers arent gonna be too much help.

is it safe to weld to the rocker panel area to set it up on the dolley? one at each end on each side? is that area strong enough without rust to support a shell to allow blasting and rust repair?

well i finished teardown and found the whole floors need replacing along with that right frame rail... so i ordered and everything has arrived!! soon i will tear into it and get to cutting and replacing... any suggestions for bracing for all this removal and ideas for the best way to get that frame rail out and new one in? thanks for any help yall can give! i will be puttin some pictures up in the next couple days