@bwengals has now posted an HGSP “starter” notebook. The notebook uses the well-known cherry blossom data and walks through a variety of approaches, culminating in the Hibert space Gaussian processes he discussed in his live talk (soon to be posted to the PyMC YouTube channel).
The notebook can be found here. If you try it out, either with the cherry blossom data or with your own data, feel free to post comments or questions about how it worked out for you.