Ah, right. Bit busy with work at the mo. May try to create something usable later. I don't think it is hard at all, just needs a little thought to make it flexible. I've an outline idea in my head so hopefully I can get Copilot to code it for us. 
i have to apologise. I had intended to get started on this. But unfortunately a family health crisis has meant that I am not going to be at home this week & will be tied up with legal and other issues. Being away from my main PC, even though I do have a laptop with me and being rather emotionally shattered, I doubt I'll get time this week now.
This is on the radar now though and I will get to it as soon as I can.
No problem Julian. This is @smanjunath211's issue, not mine.
I just commented whilst keeping abreast of uibuilder news 
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Look after yourself first and foremost Julian !
Craig
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Quick update on this topic.
It isn't hard to create an overlay containing anything you like. Hide it using CSS and show it when needed by simply changing the style (or class if that's how you are hiding it.). Give the outer <div> styling that positions it manually (position: fixed) and set it's z-index to a high number to force it to be on top of everything else.
In v7.2.0, we added a new built-in web component <apply-template>. So you could also use that to keep your HMTL hidden until needed and use JavaScript to clone it to wherever you wanted it. That is also available as a uibuilder client function if you prefer to do it all using JavaScript.
I will come back to a proper modal dialog box in the future but note that in v.7.5.0, you have the new showOverlay feature. That isn't modal but can contain HTML and can be set to either cancel manually or via a custom button. It's position is always fixed at the centre-top of the browser content window.
