import cadquery as cq

w, h = 30.0,40.0
th, dia = 10.0, 22.0
pad, rf = 12.0, 5
cb_dia1,cb_dia2, cb_d = 2.5, 5, 4
ch = .5

result = (cq.Workplane().box(h, w, th)
    .faces(">Z").workplane().hole(dia)
    .faces(">Z").workplane()
    .rect(h - pad, w - pad, forConstruction=True)
    .vertices().cboreHole(cb_dia1,cb_dia2, cb_d)
    .edges("|Z").fillet(rf).faces('>Z').chamfer(ch))

from cadquery.func import *

r = rect(h, w)
locs_cbore = [v.Center() for v in rect(h-pad, w-pad).vertices()]
c = face(circle(dia/2))
cbs1 = face(circle(cb_dia1/2)).moved(locs_cbore)
cbs2 = face(circle(cb_dia2/2)).moved(locs_cbore).moved(z=th)

base = extrude(face(r), (0,0,th))
base = fillet(base, base.edges('|Z'), rf)
base -= compound(extrude(c, (0,0,th)), extrude(cbs1,(0,0,th)))
base -= extrude(cbs2, (0,0,-cb_d))

result = chamfer(base, base.faces('>Z').edges(), ch)

c1 = circle(1)
c2 = circle(2)

f_bot = loft(c1, c2)
sides = extrude(compound(c1,c2), (0,0,3))
f_top = loft(c1.moved(z=3), circle(1.5).moved(z=2.8), c2.moved(z=3))

result = solid(f_bot, sides, f_top)

from cadquery.vis import show

f = face(rect(1,1))
show(f)

show(f, f.outerWire().sample(100), Location(z=10, rz=45))