A good place to start might be with Legaye et al 1998Article Pelvic incidence: a fundamental pelvic parameter for three-d...

and Boulay et al 2006 Article Sagittal alignment of spine and pelvis regulated by pelvic i...

and a nice paper on reciprocal axial relationships would be Roussouly et al 2005 (https://journals.lww.com/spinejournal/Abstract/2005/02010/Classification_of_the_Normal_Variation_in_the.16.aspx).

But be careful using normative data considering the huge amount of normal variation (see Harrison et al 1996: https://journals.lww.com/spinejournal/Abstract/1996/03150/Comparisons_of_Lordotic_Cervical_Spine_Curvatures.2.aspx)

...and considering changes/variability in curvature during the course of the lifespan in normal human aging (see for ex., https://europepmc.org/abstract/med/7676332 and Vedantam et al 1998Article Comparison of Standing Sagittal Spinal Alignment in Asymptom...

Good luck!

Search for CT data. surface topography shape may not be adequate for your task due to the lack of well compared data for Surface topography and CT obtained in the same (standing) position.

The normal angles of physiological curves of the spine and pelvical incidence are to be found in the textbooks of anathomy. However, the adult deformity is something different and may display a vast range of deviation. For your idea of premoulded rods you have to measure the existing deformity angles, the angles obtained by traction x-rays and to add a possible correction angle. Unfortunately, adult deformity is usually very rigid and the correction is difficult. Preoperative release surgery is often necessary.