Dear Ipac team,
I have just took my first steps with this new tool (EBUL Ursel) and I can tell you, it is a big step forwards compared to the ac3d approach!
Adding tarmac and lines is quite easy and fast. This tool, once finished, could make a huge difference to the Aerofly community.
Thanks for looking into this!

I am familiar with both Xplane and Aerofly and I strongly prefer to fly Aerofly. The ground scenes are much more realistic and it flies smooth 
On te other hand Xplane has a very good finished airport modelling tool called WED (World editor) I would strongly advise to take a look at it.
Many suggestions given above are all available in this tool. Just to name one :
1)object positioning.
- Objects are selected from libraries which you an easily create yourself. Just a make a folder structure and make a library.txt with the content.
- Objects are shown with the real image (top view) on scale.
- Once selected you can move it or easily rotate it by pulling the arrow.
2) Adding lines.
You typically add a taxi line on top of a tarmac surface which makes it indeed very hard to select.
Ideally you should be able to select the Line type before you start drawing. Now you have to edit each line (with the difficult selection)
What about the lights along the runway, taxi lines etc?
3) It would be handy to get a list/folder structure at the side with all objects, surfaces you have created. Just clicking them could make it 'selected'
It could allow changing the properties such as name, coordinates, rotation ...
4) Sometimes it would be very handy to import ortho photo's with more details (eg.geotiff) This would make it much easier to draw.
(see my second airport EBBL)
I am looking forwards to see my creation (after conversion) in the real simulator.
Good to see progress. I hope to see many more nice airports now. 
Regards,
Stefan