So why do you "need" a fuel cell?
Why not use a stock tank?
Cheap and conversions don't normally go together unless you spend a lot of "time" doing things yourself. And having a place to do really helps.
Now that I've totally discouraged you....
You might as well build in a cell following rules of the sanctioning outfit closest to what you are emulating. Most times they have already laid out what you can and can't do, and mostly it's safety related. I don't know enough about the 05's fuel systems to say whether you can easily remove the canister, but most times it's just as easy to extend lines and move it, and that also helps a little to save our air that we all breathe.
In my case, on a stock '91 motor I used a frame mount high pressure pump from a mid 80's f150. A ranger will work too. I bought a cheap low pressure pump and mounted it on top of the cell. I fed an accumulator from the same donor, from there to the high pressure on the frame rail. I used all the same return and evap lines that were stock, plumbed them in with Russel AN fittings. If I was to do it again, I would use generic "jic" fittings as they are a hell of a lot cheaper and do the same job.
I don't know that any of this will help but good luck in your build,
Richard