Aside from the gears being where one has to pull covers, the dead give-way to spot HEAVY lathes vs light really IS width of carriage and it's "wings".
WIDE carriages have immensely greater surface bearing area, most especially when the bed is wide and the vees are larger as well. Those wear at a TINY fraction of narrow ones, resist a tool-tip deflecting, digging-in, crashing under heavy torque, in favour of smooth, rigid cuts and nicer surface finishes even when ripping heavy chip.
Skinny carriage lets the maker get longer travel onto a shorter bed, but wears faster, so is out-of-spec SOONER, and is too easily deflected, even brand-new hence cannot stand as much power applied. One can still make nice parts, as with even a lowly SB nine. But yah have to take more cuts and lighter to get there.
No fear. Yah just DO that.
"Run what yah got".
For future "run what you WISH you got.."
Look at ANY of the "Grand Old" lathes all the way back to War One.
All of them have wide/long carriages. That - and decent spindle bearings, is how and why they survived to be classed AS "grand-old" when lesser lathes were born, worn, died, were scrapped, one generation after another.
The 10EE? Doc can go measure his ones. 20 inch long-axis traverse.
But the 10EE carriage is
wider than 20 inches!
Even 80 years in and NOT EVEN yet refurbished.. they can still make good parts with 4 and 5 HP taking a serious cut.
Your lathe is closer in design to the generic
mainland Chinese ones, not-even "generic Taiwanese" units.
See "Precision Matthews". Tall, skinny TS & HS. SHORT / narrow carriage.
Compare it with an ancient Hendey "tie bar" cone-head.
Mass is not the only determinant.
Yah have to put the Iron in the right PLACES.
Cazeneuve actually did that better than Monarch. Not hard. They started later, when more was known, already.
They got 7 HP and easily as good a rigidity if not BETTER, and nominal 14" X 30" (16" clear) into right about 50 to a 100 lbs less avoir than a 10EE with 3 to 5 HP and nominally 10" (12 1/2" clear) X 20" c-to-c.
Not "six tons", either, BTW.
Ton and a half. Right close to 3250 avoir for a 10EE, around 3100 for the cast-not-weldment base generation one HBX-360-BC. Still around. They just got a brain added-on:
CAZENEUVE - Optica Siemens English - YouTube
Your one will not be blow-away-light, but... it was built to a different market segment with a different set of priorities. It is what it is,