Field of vision study using corrugated paper
board mock up to develop optimum location
of gauges.
Instrument panel mocked up in plywood to
verify switch and gauge locations.
The gauges to be used were selected from the catalog of Classic Instruments. The gauges were drawn
in on the layout using the published dimensions. Paper cut out drawings of the gauges were added to
the corrugated paperboard plane to verify readability from the driver’s seat.

A mock up of the rough architecture of the instrument panel was fabricated from 12 mm (.50 inch)
plywood, and 50 mm x 50 mm (2 inch x 2 inch) pine boards. The rough instrument panel mock up was
fitted with a piece of 3 mm (.12 inch) particleboard with holes drilled to accept 3 dimensional mock-ups
of the gauges.
CAD drawing of interior prepared by
Craig Sandvig.
The gauges were mocked up using corrugated paperboard and hot melt adhesive. The gauge mock-ups
were fitted to the cluster mock up to verify clearances to the steering column mounting brace. Copies of
the paper layouts were given to Craig Sandvig that identified the locations of the “hard points” he
would use for developing the surfaces of the instrument panel. Craig developed the overall “theme” of
the panel and some of the details.
CAD drawing by Larry Conger of instrument
panel used to machine the molds.
Craig transferred the information to Larry Conger who then developed the final surfaces of the
instrument panel. Larry designed the panel on his computer taking into consideration the inside surface
of the windshield, the door trim panels, the windshield support structure “A Pillars” and the
transmission tunnel. Larry also designed a recess of 1 mm (.04 inch) to the entire upper surface of the
instrument panel to accept the leather trim. After a review of Larry’s CAD drawing the team
recommended some revisions. Larry made the revisions and then sent the CAD file to Chris Mason in
North Carolina on 27 May 2004.
The molded fiberglass instrument panel was completed on 26 July 2004 and shipped via UPS to our
Copyright 2006 GDT Speedster LLC
The instrument panel was developed using full size layouts, reduced scale layouts, wood mock-ups and
CAD tools. The first step in developing the instrument panel was to establish the plane of the gauges
and the field of view thru the steering wheel. The gauge plane was located 260 mm (10.24 inches)
forward of the front plane of the steering wheel and perpendicular to the centerline of the steering
column. The field of view was established on the layout and verified by fitting a corrugated paperboard
“plane” to the vehicle.