Alphabet, phonetics and pronunciation

Sempo'gwi's alphabet consists of 24 letters, as follow:
A B D E F G H I J K L M N O P R S T U V W X Y Z

Each letter represents ONE phoneme, that never changes.
Note: Where it's needed, I'll use IPA's phonetic notation, in case your browser can't show the symbols, they'll be followed by X-SAMPA.
X-SAMPA and IPA conversion table: http://www.let.rug.nl/~kleiweg/L04/Tutorial/xsamchart.gif

a: /a/
b: /b/
d: /d/
e: /e/
f: /f/
g: /g/
h: /h/
i: /i/
j: /ʒ/ /Z/
k: /k/
l: /l/
m: /m/
n: /n/
o: /o/
p: /p/
r: /ɾ/ /4/
s: /s/
t: /t/
u: /u/
v: /v/
w: /w/
x: /ʃ/ /S/
y: /j/
z: /z/

In case of doubt of pronunciation, here follows an APPROXIMATE guide for English speakers.
Note: "(apr.)" reffers to phonetical approximation.

a: (apr.) father
b: able
d: cloud
e: (apr.) enter
f: force
g: ago
h: high
i: peach Note: this phoneme is shorter than the one used in English
j: pleasure
k: remake
l: club
m: mother
n: nothing
o: (apr.) open Note: this is a monophthong, not the diphthong /oʊ/ /oU/
p: apple
r: (apr.) whatever Note: the referred phoneme occurs only in American accent, where, in this case, the "t" is pronounced as a tap rhotic
s: seven
t: star
u: you Note: this phoneme is shorter than the one used in English
v: view
w: water
x: sure
y: youth
z: zero