skeletal champion synthesist summoner?

[Dr van Boom]

Ok hi guys,

I am going to play a skeletal champion synthesist summoner, using the eidolon shell to hide my undead apprearance (not the aura). I know thats not really possible RAW, cause the eidolon looks tranlucent and "fantastic", but my gm liked the idea of summonig the living shell that he allowed it :D

Now to my main concerns. Theres a couple of questions that arise:
1. do i keep my undead immunities while in fused form?
2. what happens to my hp and fort saves cause i suddenly have a con score?
3. does the eidolon shell get con hp or cha hp? (probably con)
4. should i go for skill monkey or melee ripper/tank?

What do you think guys?

[0gre]

The eidolon portion of you is a living outsider so it would get all the benefits and disadvantages of being alive. You would keep your undead traits with regards to your mental stats though.

So:
1 - You do, eidlon does not (though this only applies to physical stuff, it has no mental stats)
2 - I would suggest nothing, your eidolon's HP would be based on CON though and... it's saves would be con based.
3 - con HP
4 - ?? up to you

Mostly just work it out with the GM. It's a pretty generous combo since your CHA determines your casting abilities, hit points, and one of your saves, plus being undead you are immune to gobs of stuff.

[Dr van Boom]

1. since the eidolon cant be targeted separately and effectively has no hp(the hp is simply temporary hp that i get), would the fused form still be immune to cold for instace?

2. the eidolon has no saves of its own, therefore i have to use my saves?

3...

4. leaning towards skilled tank right now

to it being fairly generous, dont forget that i lose some caster levels due to the template, especially the racial hit dice hurt a LOT!