www.wysiwygwebbuilder.com

I want to have a go at doing something along these lines ...

http://t7t.wise.marketing/quoteengine/

Is this possible (visual effect, while collecting form data) within WB ?

I can't get my head round how to achieve it - in particular closing the gap between displayed components (when other options are hidden)

You may be able to do this with events and/or conditions.
If you use floating/flexible layout then hidden objects will not take up space in the layout.

Excellent, thank you - will 'go and have a play' (and come back if I make a hash of it )