Ok,
I'll bite.
Alloy is bottom line more to build $$ and more to buy $$.  (way more than you plan no matter what)
Like it or not, its the case.  I only chose alloy for my HTM as I could not replace the glass body so alloy was the route.  
I have three alloy cars
Goldie 1/2 alloy 
289 progress........
HTM111 ~ 60%  
HTM111 - Back to basics and forward with build
AC1085 - Alloy 
427 S/C - Alloy, so three + 
427 Alloy Body Build under way ........
Alloy benefits:  ................  
Drawbacks:
Its alloy 

 .....................   $$$$$ way more than you plan on and FRAGILE...
Sell time more $$$$$
Glass or Carbon fiber benefits: ................. 
Drawbacks 
Cheaper   ............................................  People attitudes
Tougher
Easier to fix
Cannot tell in general once painted
HTM111 is alloy windscreen back and hood.
I did this as the costs mount fast, very fast.
Plus I like to have the durable front that can be leaned on when wrenching and withstand rocks while driving.
My friend Lynn P asked, you plan to sell it, I said no.  He said my course of direction is great then 
 
A well done car is well done car in either case, a badly done alloy car is less favorable than a awesomely done glass car every day!
Quality is key!
A great replica is always better than a bad one no matter what its made from.  Focus on awesome and what you want, then it will be perfect.