Just out of curiosity what equipment would you use to do the job? My experience is limited to hydroseeding. I think a slit seeder is good for lawn renovations and repairs but would agree it wouldn't be my first choice for a new lawn install. The two options I would look at are hydroseeding or applying the seed with a spin spreader and topdressing with compost but I would enjoy hearing what your approach to doing the job would be. Straw would be another option but not one I would consider as good as the other options.