For transcribed rolls, you will need to locate this book --
Simpson, Harold B. Hood's Texas Brigade: Lee's Grenadier Guard. (Waco, TX : Texian Press, 1970)

Other sources on the 5th Texas Infantry can be found here --
http://www.tarleton.edu/~KJones/txbiblio.html

Here is some information on Company "D"
http://www.fortmadness.com.ua/5thtexas/history.html

Here is a roll for Company "H"
http://www.texas-brigade.com/5texrostercoh.htm

A roll of Company "I" covering the period 1862-1864 can be found at the University of Texas --
http://www.lib.utexas.edu/taro/utcah/00041/cah-00041.html

5th Texas 1862, Second Manassas by Don Troiani