Custom propane fire pit

i am planning on turning an outdoor area that was formerly used for plants into a fire pit.  the area is 1ft by 6ft, is about 4 feet high, and most closely resembles the picture in the “creative / unique” section entitled “Long, narrow fire pit.  i am a weekend do it yourself-er, but since i am attempting a do it myself with items that could blow up, i need some advice.  i understand that some of the questions might be rudimentary.

1 – is there a kit for a long narrow install, most of the ones i have seen are circular

2 – if no kit is available, what kind of piping / hose needs to extend from the propane tank to the pit (flex line, aluminum, sealed plumbing pipe, etc…)?

3 – i saw mention of a “pan” that needs to be installed underneath the pipe in the pit to catch propane that might leak, is there more information available on this

4 – what type of regulator do you recommend for the propane tank

5 – what type of thermocouple do you recommend, and where is this installed

6 – does the inside of the pit need to be treated with anything?  i saw mention of the aquatic glassell, but i am not sure i understand if this is necessary for what i am trying to do.

i can send pictures if someone could explain to me how to attach them.  i am sure once the dialog begins, i will have more questions.  any info you could provide is appreciated.

thanks