The problem is that Avengers in general aren't too popular anymore. But if you feel that you have enough experience with the character and are willing to spend time writing a guide, I say go ahead with it, you have nothing to fear but criticism.
I've been working on an avenger who makes use of salvation as his main synergy. The idea is to get max resists with little problems making it ideal for HC.
What I want to know before I do work on a guide is are people interested?
Speaking from a Hardcore perspective, I'd still say that this isn't going to work well for you. I say this from experience too, as I have tried it. I'll at least go over it with you though, as in, where the problems came in:
1 - Max Resists were easy and fast! Everyone benefited from it, and it was great. Everyone loves Salvation on them.
2 - The synergy to the Veng attack is there; it's very small but at least it's something more than nothing (20 points = 40% more damage on all of your elemental attacks, 120% total extra damage to Veng).
1 - Using Salvation means you're not use Conviction very often. That means you're literally losing out on the huge damage bonus, the ease of hitting, and you're going ot have to have a high AR rating to actually hit anything, and you won't be leeching much with Veng, while the mana cost is high (and in this build, you probably should max out Veng since you don't have conviction to help you all the time). So you're literally losing out on more than doubling your damage and you're losing tons of gear options to make it easier to hit things, due to requireing a very high AR to hit things later in the game.
2 - With low damage, low leech and low speed, the game is ok in Normal. You will notice it slows down in Nightmare, but it may still go ok in Nightmare, especially at higher levels (but you'll notice a very slow killing speed in full 8 player games in Nightmare). Once you get to hell, the killing speed drops to a halt, because you will be losing 1/3rd of your damage on virtually everything. On top of that, you don't have conviction, so you're not lowering their natural other resistances either (aside from their immunities). In short, in Hell, without conviction, your Veng will not do much at all and since you will not be leeching or killing fast, you may find yourself in trouble very often.
1 - In Hardcore, if you have a character in Nightmare, go on small runs where you slaughter lots of little monstors, like Act3 Flayer Jungle for example. Anywhere really. Just search for an exceptional paladin shield, like a Sacred Target, and look for one with 30~40% resist all naturally built in. Use your socket quest and get 4 socket. Fill her with Dimonds. You can easily break 100%+ resists with that shield. This literally replaces Salvations effects, leaving only the damage synergy which is low remaining. This allows you to now use the resistance auras, to raise your max resistance (which allows your shield to do more, by getting upwards of 85% res all even in hell). Then you're free to not put a lot of points in veng (lvl 1 for example) since the res auras will raise it much faster and higher than single salvation will. On the other hand, you can also start using conviction, which will more than double your damage and drop your need for high AR.
2 - If you want to use Salvation as the main aura, no matter what, I suggest not looking at Veng, but isntead, look into Charge and Veng together. Look at higher phsyical damage attacks, that don't require an aura to make them work. Charge is one of these. You can get Charge's damage pretty high, even with zero aura going on--allowing you to use Salvation. Then you simply buy a Might Merc and let his Aura tranfer to you. You benefit from very high damage, pure salvation, and your merc gets the same benefits.
Then use a big two-handed weapon for massive damage. An upgraded Steel Driver would be pretty cool. Or maybe a big insight polearm due to cheapness and massive damage? Insight Eldar staff is an option too; it's very cheap, very low requriements and will do very large damage and look very cool!