I just compared Mongoose's supplement with the German robot
supplement for Mongoose Traveller (which is an original work, not
a translation of Mongoose's supplement). Using that German sup-
plement, robots become a lot less expensive, I think the costs are
on average about half of those of Mongoose's supplement, or even
less than that.
Unfortunately the two design systems are not really compatible, for
example the German supplement bases the price of the chassis on
the robot's Strength, Dexterity, Hull and Structure, which have se-
parate point costs depending on the technology level. For example,
a Strength point costs 441 Credits at TL 10 and 126 Credits at TL 15.
There are no separate costs for the installation of devices, and their
prices are almost identical to the prices of normal equipment. For
example, a TL 8 communicator costs 225 Credits "flat", without any
costs for installation and any cost increase because it is built into a
robot.
There are no slots, but each device added also adds mass, which de-
termines the price of the drive system and the power system. For ex-
ample, Legs require 1 % of the robot's mass per km/h of its intended
speed and cost 100 Credits per kilogram.