Chassis can be done at nearby metal workshop better if you go to a place with laser cutting machine..
anm,
the getting done cabinet may be little bit tiring..specially in delhi ..at my place I get many workshops nearby.
for HTPC, pick up a dvd player cabinet ,remove the front
I am sure at lajpat rai market you will get it .Just increase the height with some MDF (spray paint to match the color)on 2 sides and back.. to suite your needs.
..for front take aluminum 4mm sheets cut to size 1 piece,all vendor wont give cut piece.....you need to visit metal market...
get the metal polished/sanded...anodize or clear coat on it.
visit PC modder forums you will get tons of ideas...
approx estimate:
dvd cab=500
mdf=200
aluminum=300
metal and wood work,polish,paint=2000
cha_indian,
that pic was i took from net ..
chassis can be easily made by 1 dvd player case adding an aluminum front.... a little polishing on aluminum,screen printing and a clear coat spray...
online you can buy chassis but will b costly because you
have to import like
HIFIDIY STANDARD ALUMINUM CHASSIS-HIFIDIY