Store and using directory path references

[Heime]

I have a lot of defconsts to store as directory path references, essential
for loading and requiring files associated with specific functionality.

Because I have many such path references, can this sequence of directories
be differently constructed so the values can be defined and accessed more
easily.

(defconst mars-orella-waypt
  "~/bin/gadin/orella"
  "Docstring"

(defconst marshal-waypt
  (concat mars-orella-waypt "/marshal")
  "Docstring"

(defconst mars-okta-waypt
  (concat mars-orella-waypt "/okta" )
  "Docstring"

(defun mars-okta (&optional actn)
  "Locate and load 'okta feature.  Progress action message."

  (add-to-list 'load-path mars-okta-waypt)
  (require 'okta))