Erik, you need to develop a plan to get this car going, I wouldnt rush out and buy frame rails, YET. I am sure you will need them, but use your resources wisely.
First thing you need to do is get yourself a safe working area, working on the ground, outside on the patio is less then desireable for the scope of work your suggesting you need to do. You need a good solid cement pad (floor) that has covering, either a garage, or a good solid "cover-it" shelter. Then you can get it set up on 4 tall jack stands and plan your approach.
Second, get a notebook, and start writing up what you need to do. Use a page for each "Major" repair, then on each page write what you need to do to accomplish the repair, ie: Fix Floors, Need, floor pans, torch or plasma, hammers, welder, clamps,,
Now that your plan is developing, make a list of what you need to buy first, from most important to least important. Here is where good research pays huge dividends. Check and double check prices and availability, gather as many catalogs as possible, and mark them up to suit your needs. Make a wish list, and a gotta have list for all the areas you need to work.
Now plan your budget based on your research, make your purchases count, get the needs first, then your wishes.
A good tip, whatever your guesstimate budget is, double it.
Good luck, and remember to HAVE FUN
