I have a feeling this will get taken out of the 'build' section and put into the YJ section.
I am a TJ guy so can't actually give you the specifics but....yeah a SYE is needed along with a CV driveshaft unless you are going to do a transfer case drop because without this the angle on your driveshaft will be too steep for the U joint to deal with. This causes major driveline vibrations
Have a look here Pirate4x4.Com - Extreme Four Wheel Drive
And extended brakelines are needed unless you want to roll without brakes becaue you ripped your brakelines loose.
And I would wait the week until you can afford them and install all in one. Driving round with mismatched suspension parts is a recipe for disaster