My crack at a Fuller's Porter Clone

Fuller's uses brown malt, which to my knowledge isn't available to me, as 12% of the grist (according to a number of sources I found via searching). I used a combination of Victory and Roasted Barley to try to come close to what brown malt might be...

For 5.5 gallons into the fermentor:

8 lb 8 oz 2-Row ---------- 76%
1 lb 2 oz Crystal 60L ----- 10%
1 lb 0 oz Victory --------- 9%
0 lb 6 oz Roasted Barley -- 3%
0 lb 4 oz Chocolate Malt -- 2%

Mash @ 153 for 75 min

Est. OG at 70% Eff: 1.053

2 oz Willamette @ 60 min

Ferment with a dry English ale yeast in low-mid 60's, aim for 75% attenuation to finish at 1.013.

Comments? Concerns?

If you don't mind ordering online, Austin Homebrew sells brown malt.

http://www.austinhomebrew.com/advanced_search_result.php?keywords=brown+malt

I'd prefer not to pay shipping on < 1lb of malt. Plus I'm interested to see how my work-around does. Thanks for the tip, though!