Help with sound changes

Could anyone check these sound changes for realisticness? Any other feedback
is welcome...
Thanks,
Trebor



Grand Master Plan (GMP)

This is the Grand Master Plan (GMP) which I am using to derive a new
language from English. This project aims not only to derive a phonologically
different language from Modern English (namely the Southern Ontario dialect
of Canada), but also a grammatically and lexically different one. Below are
listed all the sound changes I employed, using X-Sampa.

Consonants
p_h, p>p
p_h, p>? (when not starting a stressed syllable)
b>p
b>p>? (syllable-finally)
m>m
m=>m@
f>f
f>p>? (syllable-finally)
v>f
v>f>p>? (when not starting a stressed syllable)
T>t
D>d>t
t_h, t>t
d>t
n=n
n=>n@
tS)>k
tS)>k>? (syllable-finally)
dZ)>g>k
dZ)>g>k>? (syllable-finally)
s>s
z>s
r\>4 (syllable-initially; see the vowels section below)
r\=>3
l>l
l=??
S>C
Z>j\>C
k_h, k>k
k>? (syllable-finally)
g>k
h>?

Consonant Clusters
pr\>P
pl>tK)
br\>P
bl>pl>tK)
pt>t:>t
bd>*d:>d
fl>K
tr\>ts)
dr\>dz)>ts)
sp_h>p:>p
sp_hr\>P
sm>m:>m
st>s:>s
st_hr\>ts)
sn>n:>n
sl>K
sk>S>C
sk_hr\>h4>4
kt>t:>t
ks>s:>s
kr\>h4>4
kl>*hl>K
gz>z:>*z>s
gr\>h4>4
gl>K
kw>k

Vowels
i>i:
ir\>i:
I>i
E>e
er\>e:
&>A
A>A
Ar\>a:
V>@
word-final A>@ in polysyllabic words

Diphthongs
@U)r\>o:
@U)>o
U>3
u>u
AI)>A:
EI)>e:
OI)>o:
&U)>A:
m, n>0, nasalizing the previous vowel
wi>u:j>u:
wI>Uj>u
wE>ew>ju>y
wA>Aw>A:
w@U)>o:
wAI)>A:w>A:
wEI)>e:w>ju:>y:
jA>A:
jE>e:
j@U)>o:
ju>y