5 specialty Malts is a lot for one beer. I like to combine a couple of base malts and one or two of the specialty grains if you want complexity. I’m not saying it’s not going to be good. I just think if you brew this version, then brew it again taking out one or two specialty malts, your going to like the one with less, better. You could also do it the opposite way, and start with a smash beer and build up from there. Keep throwing things in one at a time and see which version you like the best. It may take a bunch of batches to nail down something you really like, but that’s just more brewing and more drinking. All good stuff, you will probably be surprised at how good the smash beer with just the extract and Pilsner can be. If you have the ability to do split batches that could save some time. You could split a 5 gallon batch into 5 2 gallon buckets, steep and boil the specialty grains separately and add a different one, or combination to each bucket.