build sheet/prices, forgetting anything?

[87supra7mgte]

so ive started compiling a build sheet for my supra next year and prices of the parts, advice on any cheaper prices found for anyones build/better parts or what doesn't really work, only things i can think of i haven't decided on is intercooler piping, a piggyback system, if i will need one even, and wideband o2 sensor. opinions/suggestions on any part of this would be highly appreciated as always, listed also are where i located the parts at

engine parts store
engine rebuild kit-499.95
ebay
turbo header~175
jdm 50mm external wastegate-90
titan motorsports
brian crower stage 2 cams 264/264-706.88
ARP head studs-128.99
ferrea valve package(1mm oversized valves)-1497.76
adjustable cam gears-150 each
550cc RC engineering inj-535
clips for injectors-48
walbro fuel pump-150
weldon FPR-225
koyo radiator-350
electric fan upgrade-320
tein flex coilovers-1611
apexi avc-r EBC-475
hks type o turbo timer-95
wiring harness for timer-15
fidanza alum flywheel-456.56
suprastore.com
SPEC stage 5 clutch-609.99
aluminum 1 piece driveshaft-369.99
ultimate r154 build kit-595.99
greddy timing belt-160
high output alt.-165
lexus afm-250
stainless steel intercooler plate-95
gates radiator hose kit-69.99
goodridge braided brake lines-119
hks twin power ignition-415
greddy top speed eliminator-76.25
suprasport.com
quick/sport shifter v3-300
LIPP FFIM-1100
enjuku racing
brian crower pro series connecting rods-1052.99
andysautosport
rays/volk gts-18x10+37-1540(rear)
"-18x7.5+37-1440(front)
turboneticsinc
custom t4 turbo with 60 series compressor, ceramic ball bearing F1-62 turbine wheel, .68 turbine housing A/R-1299
treadstrongperformance
tr12 4.5in thick IC-355

total so far-16439.58


weak points considered-rear end and half shafts, any idea of power they can handle? looking to put 500+ to the ground, will block handle this? looking to push approximately 12-13 daily and around 20 at the track, attempting not to bore or stroke the engine, boring is still a possibility but would like to not stroke it, anything else ive forgotten/overlooked at a glance?