The Pedersoli long rifle in .45 is a shooter. You don't mention what a "budget" is, but I have found T/C Hawkens for $225-350. I have a Pedersoli for sale for $650, but that's double the price of the T/C. If he wants a Hawken, the Lyman Great Plains is the most authentically built recent production rifle, though they are no longer cheap, and I don't know if they were built in .45.
If it were me, I'd go for the T/C or stretch a bit and find a second-hand Pedersoli (tho if he wants a Hawken, theirs are a bit more spendy).
On another forum (ALR) there is a Santa Fe Hawken for sale, in .53 caliber (says .54, but they were actually .53). If your friend is tall, the LOP is heavenly at near 15" (I have one and LOVE it), the 1" barrel is very light compared to the 1-1/8" often seen in that caliber, and it is a good shooter. Spendy compared to a T/C, but it would likely be the last Hawken he'd want if he is set on one.
Your friend has a lot of options. Do whatever you can to help him smile, our hobby needs more guys in their late 20's!!
David
NM
[well past his late 20's]