The new Mörserlafettenwagen for Scheckinators Prussian army - background: a fabulous Grenadewagen by Matthias Manske.
After a period of research and experimentating round about the contsructions of carriage models of the prussian, saxon, russian and french army, I found some very interesting sites:
The digitale Archiv Marburg has a collection of detailled construction plans:
and a google-book from the author Friedrich Gustav Rouvroy, who describes the constructions from every country:
Vorlesungen über die Artillerie zum Gebrauch der Königl. Sächs ..., Band 2
Thanks to Matthias Manske, who fabricated the most beautiful wheels and sent me 12 pieces! So I built the first prussian mortar-carriage "Mörser-Lafettenwagen" in the scale of 40mm. The construction material is polystirol, what is very simple to cut and glue.
Horses and soldier are pieces from Nürnberger Meisterzinn.