After importing to Hammer I've got two rooms in the start
No problem. I just uploaded them in a .zip on a hosting-files page.
Mirror 1: https://mega.co.nz/#!6VlxyZCC!eBLAVjdZm ... DuNOPStuCA
Mirror 2: http://rghost.net/45794282
Ricardo you can attach images to your post using the Upload attachment button. We discourage external links unless it is from steam as not all hosting sites are virus-free. Thanks.
Mirror 1: https://mega.co.nz/#!6VlxyZCC!eBLAVjdZm ... DuNOPStuCA
Mirror 2: http://rghost.net/45794282
That double room is the normal design when you make PTI maps 
there's the elevator part, then the lightboard hall, then the map. If you are about to change things in hammer, you can easily erase that intermediate room if it's so annoying to you.
About the numbers in the lightboard, I believe that "02" is because you have another published map in your workshop, or maybe because, even though it's not published yet, there is another saved map in your puzzle creator library.
useful tools and stuff here on TWP 
[spoiler]
[/spoiler]
The world portal door is a bit annoying, but you can change it by changing it to a prop_testchamber_door and moving the various pieces together in Hammer.
Many thanks everybody, you solved my doubt!
Sure, next time I will attach them on the forum, thanks to you!