Cabinet is 3/4" plywood, so you can generally use the external dimensions and take off 1.5"/3.8cm from all of those to get the internal dimensions. Note that the front baffle is set back from the front, so you need to take that into account as well when considering the front to back dimension.
The spec sheet says it's tuned for 40Hz, though that will be with the stock speakers. Which are hard to track down definitively but highly likely it's a Peavey Sheffield 1035-8. The 75W RMS rating (x 4) matches the cab's rated handling if you add in 50W for the tweeter.
Peavey Sheffield TVX 1035-8 10" 300 Watts Peak 8 Ohm Bass Speakers (493620):
10"
Impedance: 8 Ohms
Power capacity: 300 W Peak 150 W Program 75 W Continuous
Sensitivity: 89.1 dB 1 Watt / 1 meter
Usable frequency range: 60 Hz ~ 4 kHz
Cone: Kevlar« impregnated cellulose
Voice coil diameter: 1.75" / 44.4 mm
Voice coil material: 2 layers, thermally bonded copper wire Kapton former Nomex« stiffener
Net weight lb. / kg: 7.4 lbs. / 3.4 kg
Znom (ohms) 8
Revc (ohms) 5.88
Sd (Square Meters) 0.335
BL (T/M) 9.37
Fo (Hz) 49.3
Vas (liters) 38.7
Cms (uM/N) 243.5
Mms (gm) 42.80
Qms 4.03
Qes 0.880
Qts 0.720
Xmax (mm) 3.5
Le (mH) 0.14
SPL (1W 1m) 89.1
No (%) 0.50%
Vd (cu. in. / ml) 7.1 / 117
Pmax (Watts pgm.) 150
Disp (cu. in. / ml) 83 / 1360
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