I run 1.1.2 with BL 3.9 and I want to update my baseband to 04.03.13_G but is it possible to run anySim 1.3 on a 1.1.2 phone with 04.03.13_G baseband?
The thing I want to do is the following:

i'm on 1.1.2
- update my baseband to 04.03.13_G (iClarified method)
- unlock baseband while still on 1.1.2
- soft-upgrade to 1.1.3 using devTeam method (version 3).
- result: fully unlock 04.03.13_G and 1.1.3 jailbroken!

Will this work?

Let me re-arrange the order for you (it's how I ended up with what you want to get to (04.03.13_G and 1.1.3 JB), and since you are already on 1.1.2 jailbroken (JB):

1) - soft-upgrade to 1.1.3 using devTeam method (version 3); next
2) - update baseband to 04.03.13_G (iClarified method); then
3) - unlock baseband while on 1.1.3 using anySIM 1.3

- result: fully unlock 04.03.13_G and 1.1.3 jailbroken!

okay. that's a better order then! maybe a bit off topic but will there be an update via iTunes and JB too? (the way 1.1.1 and 1.1.2 got JB)?? Thanks!