Thanks for the kind comments.
I kept track of every nut, screw, piece of wood, and bottle of glue. The build was just over $4000, until I replaced the springs and axle. Now it is $4650.
Cost
$75 2x4 deck wood, screws, glue
$120 5000 btu air conditioner
$40 undercoat paint
$170 six sheets 3/4 plywood
$163 fantastic vent
$57 - 6' Galley Lid Hinge
$55 - one pair 1/8" Offset Door Hinges for 3/4" doors/walls
$60- two Inside/Outside Locking Door Latch/L-Handle sets, L&R
$17- one Locking Galley Lid Latch/T-Handle set, RS
$156 - two 12x18 Crank-out Windows
$50 construction adhesive, glue, electrical conduit and fittings
$100 longer trailer tongue
$25 more undercoat paint
$26 trailer hitch
$25 aluminum shore power receptacle
$ 17 under bed storage hardware, hinges and handles
$61 2x2 and 1x2 and 4x8x1/4 plywood
$43 1x2 and 4x8x1/4 plywood
$429 light fixtures, kitchen counter, drawer slides, wood siding
$273 cabinet, insulation, trailer lights, more glue
$123 wire, outlets, electrical boxes, GFCI
$235 paint, hardware, cabinet wood, more glue, laun skin
$120 battery charger and converter
$210 2 burner cook top, Coleman cooler
$23 more glue, 2 1x4x12 trim
$34 wood filler, screws, 2x2 lumber
$52 electrical plugs, clamps, outlets
$107 battery
$600 aluminum siding and angle
$200 specialty aluminum trim.
$200 hardware, hinges, stainless screws, butyl tape.
$500 trailer
$400 3500 lb axle and 2 1400 lb springs
$4650 Total