Hi,

1. Not yet.
2. Yes, but based on Helix Ultimate 2.0.
3. Anytime you can install SmoothScroll plugin (find on JED) to get nice scroll effect, whole rest is easy.

Old, but still valid: https://www.joomshaper.com/blog/how-to-build-onepage-layout-using-sp-page-builder

Thanks Frank, all best M

The smooth scroller I use, because it has a lot of controls, is called Smooth Scroll Anchors. It has been around a while, but it works beautifully still, including on all my Helix Ultimate / SPPB combinations. It might cost a small amount.

Thanks "blue_Shift", I used this same and also others like: aikon Smooth Scroll. As we both know, nobody create websites for free, so small extra investment is sometimes needed to earn more.

Extra tips ($0):

1. https://joomla.stackexchange.com/questions/22449/how-make-a-smooth-scroll-menu-anchor-for-a-onepage-site
2. https://css-tricks.com/snippets/jquery/smooth-scrolling/
3. https://www.w3schools.com/howto/howto_css_smooth_scroll.asp

Thanks Blue_Shift, Yes, I've used Smooth Scroll Anchors and everything works perfectly. It also has a VERY useful offset setting so that those fixed headers don't cover the heading of the section.

And yes Paul, well spent money :-)