Should it be better to ask admins for a dedicated subsection "Nakasig 3G Development" on the Nexus 7 section ?

No, the admins won't open a subsection especially for the "Nakasig".
That's why, I have open this thread

and if you want to discuss about N7 3G, you can go to this thread and discuss about all of your problems and solutions about it
NEXUS 7 3G-"nakasig"-For all Your Jelly Bean Discussions, Problems and Solutions

I noticed the link for the N7 index actually takes you to your Asus Transformer index thread instead.

Originally Posted by John_Q

I noticed the link for the N7 index actually takes you to your Asus Transformer index thread instead.

Thanks - Link changed

and

[Recovery] official cwm 6.0.1.0 [update 7/21] by WinDroidGuy => Added OP

Ok, I will see with admins if it's be possible to open a sub-forum about the Nexus 7 3G
and go to this thread and post your requests : [All XDA Members] Requests to Moderators and Admins
and here too: *** New Device Forum Requests ***

OP UPDATED - 21 nov 2012

---

with
first rom special for N7 3G:
[ROM] Jr1 3G (JOP40C / 4.2): MCR - new: tethering enabled, SMS support

You should add http://forum.xda-developers.com/show....php?t=2011403
This lets you multiboot android and even ubuntu!
The red text about ubuntu not working on the 3g is outdated btw. And if it doesn't work, you have to use the version from this post. Don't know if the developer has updated the download link in the second post yet.

Originally Posted by Raudi1

You should add http://forum.xda-developers.com/show....php?t=2011403
This lets you multiboot android and even ubuntu!
The red text about ubuntu not working on the 3g is outdated btw. And if it doesn't work, you have to use the version from this post. Don't know if the developer has updated the download link in the second post yet.

yes his second post is updated and you will find:

If you already have older version of MultiROM installed, just flash the newer version over the old one, no need to uninstall or something.
MultiROM: multirom_v2_n7-signed.zip (md5 44ca2baca9323dcca5f67f36087d92e7)
Modified recovery (TWRP 2.3.2.3): TWRP_multirom_n7_20121125.img (md5 cb8c3b4b0e3341ca1b011169411ce0fc)

VIDEOS

---

GUIDE VIDEOS - Post #3

The Nexus 7 gets HSPA+ plus Android 4.2 by CNETTV

Originally Posted by philos64

yes his second post is updated and you will find:

The initial v2 wasn't working for 3g. But since the warning about the 3g model was removed, I think it was replaced.