The "Other" Knights: How would they look in 40k?

If you couldn't tell, I really love Imperial Knights, and it appears that FW is done making Imperial Knights, at least for the moment. That really has me a bit distraught because there are still quite a few more canon knights left to go! Because I have poor impulse control, I think I'm going to convert up a Knight Baron (counts as the Obsidian Knight), but it got me thinking about the other knights.  There aren't really rules that could adequately approximate them (counts-as Stormsword for a Warden is kinda close, but too many HP and not a walker), so in a rare-case of me making up my own rules, I've been tinkering with what I think the rules for the missing models should be.

Cerastus Knight Baron

WS	BS	S	FA	SA	RA	I	A	HP	Points
6	6	10	13	12	12	4	4	6	500

Unit Type: Vehicle (Super-heavy Walker), Character

Equipment: Cerastus Shock Lance, Rapid Fire Battle Cannon, Heavy Stubber

Special Rules: Flank Speed, Ion Shield (3+)

Knight Crusader

WS	BS	S	FA	SA	RA	I	A	HP	Points
4	4	10	14	13	12	1	2	6	400

Unit Type: Super-heavy Walker

Equipment: Castellan Quake Cannon (12-60" S9 AP3, Primary Weapon 1, Apocalyptic Blast), quad lascannon

Special Rules: Slow and Purposeful, Ion Shield

Knight Castellan

WS	BS	S	FA	SA	RA	I	A	HP	Points
4	4	10	14	13	12	1	2	6	400

Unit Type: Super-heavy Walker

Equipment: Castellan Quake Cannon, Exterminator Autocannon

Special Rules: Slow and Purposeful, Ion Shield

Knight Warden "Defender"

WS	BS	S	FA	SA	RA	I	A	HP	Points
5	5	10	14	13	12	1	2	6	325

Unit Type: Super-heavy Walker

Equipment: Warden Rocket Launcher (48" S8 Ap3 Heavy 2); Two twin-linked multilasers, which may be upgraded to Warden Autocannons (36" S7 AP4, heavy 3, twin-linked) for +20 points

Special Rules: Helical Targeting Array, Slow and Purposeful, Ion Shield

Knight "Seige" Warden

WS	BS	S	FA	SA	RA	I	A	HP	Points
5	5	10	14	13	12	1	2	6	340

Unit Type: Super-heavy Walker

Equipment: Warden Demolisher Cannon (24" S10 AP2 Massive Blast (7"), Ordnance 1), two twin-linked heavy bolters (may be upgraded to twin-linked autocannons for +10 points, or twin-linked lascannons for +20 points)

Special Rules: Slow and Purposeful, Ion Shield

The Dream

I would be a liar if I didn't say it was my dream to be able to run a Knight Household as a free standing army in most games of 40k, but with the lack of variants and upgrade options (like the ones found in 30k), it just doesn't seem like a possibility, outside of 4 Paladins in 1500 or 5 Errants in 1850, which is frankly a boring proposition... The Wardens were the hardest to figure out, they don't really compare well to much else in the game, though their firepower isn't really as devastating as many other vehicles, or even other Knights. The Crusader historically had a single twin-linked lascannon, which in epic was far more dangerous than it now is in 40k, so beefing it up to a respectable quad-lascannon seemed fair, especially when comparing it to the 6-barrelled Autocannon that the Castellan is toting around (alternatively, a Rapier Laser Destroyer would be a pretty adequate alternative).

Of any of these, I'll probably go ahead and make a Knight Baron to use as the Obsidian Knight in games of Apocalypse, or merely just my Warlord when I'm running a Paladin as my leader... A Warden is awfully tempting though.