Well, customization is pretty close and can give you desired features, but what i mean is, assembling a laptop yourself.
NO brother, a laptop cant be assembled at present in India.
HP offers some minor customizations in its business class(only) laptops.
Dell does allow customization, but you cant choose a processor or GPU.
I haven't heard of other companies.
but in US you can really ASSEMBLE a laptop, e.g. you can get a full HD screen instead of normal, get a blue ray drive etc. but remember, not here in India.