Speedcafe.com has learnt Seamer has taken over running point on the evolutionary overhaul of regulations; that responsibility previously sitting with high-ranking consultant John Casey.
Official statements aside, Seamer now is the only Supercars employee authorised to publicly comment on Gen3, which is considered his number one priority.
Click here to have your say on the state of Australian motorsport and go into the draw to win a Kincrome Tool Armour Workshop valued at $11,999.
The category has sometimes been eerily reluctant to discuss the topic, despite it clearly being a point of excitement for fans.
Personnel in pit lane too have spoken of being left in the dark regarding details.
It's understood Seamer's heightened involvement has come to ensure deadlines are met on the all-important project.
A prototype is meant to be hitting the track mid-this year before a full grid's worth of cars are built for the 2022 season. Tenders for controlled componentry, however, have continued to be issued as recently as this month.
By comparison, a Car of the Future prototype Supercar had hit the track by July 2011 ahead of its 2013 introduction.
Next year the Chevrolet Camaro will go head-to-head with a new-look Ford Mustang, and aero levels will be reduced by two-thirds in a move anticipated to produce better on-track action.
Homologation teams Dick Johnson Racing and Triple Eight Race Engineering are playing integral roles in the project.
Among teams to have openly flagged intentions for 2022 are current Holden squads Team 18 and Erebus Motorsport, both of whom are looking to stay in the General Motors family next year by running the Camaro.
As part of a coming Gen3 influx for the championship, existing Gen2 model Supercars are set to be handed down to the 2022 Super2 Series.