The scale you are planning seems perfect. If I remember correctly your warlord scales into the same region as the forgeworld model released after your build! Of course you cannot go by measurements in 40k literature as there is massive inconsistency in nearly all aspects of it.
Yes I was pleased and surprised how well my Warlord equated with the FW model albeit I feel the FW representative was a tad too short:
When and if I purchase a FW Warlord (Only if they come out with a Chaos version....) I intend to lengthen the upper and lower legs portions to give it the stature I deem appropriate.
Right now My Warlord seems just barely of the proper height According to some estimates. :whew:
"It is easier to deceive people than it is to convince them that they have been deceived."