killer request, welcome to the lair. realistic? hmmm i guess anything you can come up with in regards to the predator will be realistic.
As you can see from the suit thread there are many different looks and components to the suit that make each one special in design and look.
the trick is to find one that fits within your budget, my advice to anyone starting off is to pick a design and start building from there. there are many resources to achieve the look your going for but you need to start with a concept.
or you could just wait eventually someone sells an entire suit on ebay and most the hard work is done.
browse through the different sections and get some ideas ask around and get to know some of the folks here.