Robust Porter - 2nd Runnings from the RIS!

So did some calculations and I maybe could pull this out of a 2nd runnings from the Russian Imperial Stout. Thoughts? I know it's probably a bit complex for a Robust Porter, but it might be a cool experiment to see who the two beers turn out. I would add 1lb of LME to bring the OG of this up to 1.059

HOME BREW RECIPE:
Title: #13 Robust Porter (2/3 Batch 2nd Runnings)

Brew Method: All Grain
Style Name: Robust Porter
Boil Time: 60 min
Batch Size: 5.5 gallons (fermentor volume)
Boil Size: 6.5 gallons
Boil Gravity: 1.050
Efficiency: 70% (brew house)

STATS:
Original Gravity: 1.059
Final Gravity: 1.014
ABV (standard): 6.01%
IBU (tinseth): 42.86
SRM (daniels): 33.2

FERMENTABLES:
6.5 lb - American - Pale 2-Row (51.2%)
1.5 lb - United Kingdom - Munich (11.8%)
1 lb - American - Vienna (7.9%)
0.5 lb - German - Carafa I (3.9%)
7 oz - American - Caramel / Crystal 30L (3.4%)
7 oz - American - Chocolate (3.4%)
7 oz - American - Roasted Barley (3.4%)
7 oz - Belgian - Special B (3.4%)
4 oz - United Kingdom - Black Patent (2%)
3 oz - Belgian - Biscuit (1.5%)
1 lb - Liquid Malt Extract - Light (7.9%)

HOPS:
1 oz - Northern Brewer, Type: Pellet, AA: 8.5, Use: Boil for 60 min, IBU: 29.29
1 oz - East Kent Goldings, Type: Pellet, AA: 5, Use: Boil for 30 min, IBU: 13.24
0.25 oz - Fuggles, Type: Pellet, AA: 4.5, Use: Boil for 2 min, IBU: 0.33

YEAST:
Wyeast - Thames Valley Ale 1275