sry but no, Draconomicon p144 "other true dragons" give you instruction how to create those.
Homebrew is created due to DM/player desires. But here we have a clear instruction given to the DM and enforcing him (unless he houserules, which he can. but than it is a houserule and not RAW).
Quote:
Originally Posted by Draconomicon p144 - Other True Dragons
For true dragons other than those found in the Monster Manual, construct tables such as those above using the information on Table 3–22: Additional Level Adjustments.
So, there is no need to homebrew, you got instructions to follow. The DM needs to make a table as in 3-22.