Hobbit house skylight dome

For all the "European" Hobbits in this group:
We start to build a Hobbit house with a reciprocal roof and want to install a skylight dome on the top.
What kind of skylight did you used? And more important where do you got it?  What is with insulation? Did you use one, two or three layer?
We are located in Latvia, so cold in the winter. Hope to hear from you, and have a sunny day

I am reading this book
Building a low impact Roundhouse
It covers what you want and its published in England.

basically he used straw bales and a turf roof top, that may suit you.