First of all, I think you mean "Combi-Melta" where you have"Multi-Melta" listed for your Tactical Squads. Multi-Meltas are heavy weapons, and since you have a Missile Launcher in each squad you cannot take a Multi-Melta as well. It would also fit with the points
Aside from that typo, the list looks like a fine start, but I think you would be better served with a pair of Vindicators in place of those Typhoons. I've recommended this option several times before and people seem to like it quite a bit.
Vindicators are big, scary targets, much like the Land Raider with the Assault Terminators, and as such they draw fire from the Land Raider, or at least force your opponent to focus on one thing or risk having all of them come down on him. Hard. This also has the makings of a strong Vulkan list, but if you prefer to not use special characters I would recommend a Librarian with Terminator Armor and Storm Shield as your
HQ. Give him The Avenger and Null Zone, and those Assault Terminators will be able to handle just about anything.
Here are a couple of examples for you:
Vulkan - 190
5 Assault Terminators (5x
TH/
SS) - 200
10 Tactical Marines (Missile Launcher, Meltagun, Rhino) - 210
10 Tactical Marines (Missile Launcher, Meltagun, Rhino) - 210
10 Tactical Marines (Missile Launcher, Meltagun, Rhino) - 210
Land Raider Redeemer (Multi-Melta) - 250
Vindicator - 115
Vindicator - 115
Total 1,500
Librarian (Terminator Armor/Storm Shield, The Avenger, Null Zone) - 140
5 Assault Terminators (5x
TH/
SS) - 200
10 Tactical Marines (Missile Launcher, Meltagun, Combi-Melta, Rhino) - 220
10 Tactical Marines (Missile Launcher, Meltagun, Combi-Melta, Rhino) - 220
10 Tactical Marines (Missile Launcher, Meltagun, Meltabombs, Rhino) - 215
Land Raider (Multi-Melta, Extra Armor) - 275
Vindicator - 115
Vindicator - 115
Total 1,500
Both lists are pretty standard when it comes to tournament quality lists, and both have their merits. Vulkan's list gains Master Crafted Thunder Hammers for all of the Assault Terminators, and all of your Meltaguns and Multi-Meltas become Twin Linked (Flamers and Heavy Flamers too, but the list doesn't have any of those). In the other list, the Librarian can force opponents to re-roll invulnerable saves, or fire an AP3 Heavy Flamer to thin the herd before the unit assaults. You could take a Godhammer or a Crusader in the Vulkan list without the Multi-Melta for the same points but I think the Redeemer works well with Assault Terminators.
If you like the Vulkan list but wish to field him in a different chapter you can most certainly use him as a "counts as Vulkan" character, but I would make sure to convert a
WYSIWYG model for him and perhaps come up with some back story. Most opponents have no issue with this, but some people like the player to justify it somehow
Either way, this is just my opinion, and you can use anything you like and throw out anything you don't, but I do strongly recommend pairing those Vindicators up with your Land Raider/Assault Terminators, but be careful where you shoot with them!
Hope that helps.