For overhead radiant heat I suggest either Dayton or Vantage(could be Pro Vantage?)--they are sort of the Rolls/Bentleys of their line--pricey but well worth it--they work extremely well
For our custom homes we use Dayton for overhead and for in-floor we use Heatlink--
When using any in-floor system, preparation, let me restate that Proper preparation, of the base, depth and mapping of tubing and components, care in concrete slab placement and finish are all critical--you must have a firm stable base for your slab--if prepping for an in-floor system be sure and work with the arch/designer/contractor make sure location of all desired floor mounted equipment is throughly noted and that everyone involved absolutely knows where it is/is not safe to drill mounting bolts etc.
(been there done that--not real high on the fun factor)
On a smaller scale we've used in floor electrical wire grid bedded in setting compound under bath, dining and kitchen, patios covered and uncovered, using tile/marble/slate / hardwood flooring with excellent results--caveat though if one wire is broken on some systems the entire system is shut down--fix- trace down the culprit, tear up the floor, repair, replace floor--knock on wood we've not had that problem though I know of other builders that have.
Go with the Polycarbonate skylights--we use them exclusively--I built/remodeled homes 20 yrs ago using them and as far as I know they are just as good today as when first installed--the Mfg warranttys are just that, like a automobile, no lifetime guarantee
Different parts of the country have their own "local" window Mfg co.s--so what we use here probably isn't available in Ohio--of course you can go with the national known brands like Andersen, Pella, etc--pricey though for "name brand" recognition/quality that can be obtained from a quality local MFg'r at a more realistic competitive price.
If you have any questions during your build feel free to e-mail me and I'll help if I can---
Good luck and have fun on your new project--that is the key ingredient for having a successful build--have fun and try not to stress--
One note if you haven't already you might want to draw up a "performance" bond for all contractors and subs involved, including shop equiptment being made and delivered etc.--a good way for you to keep control and avoid cost overruns, etc due to contractor error or neglect.