c to d: types + struct/union alignment

[Michael P.]

I'm converting some C headers into D, and had some questions.
1. What is the equivalent of a 'short int' in D?
e.g: 
struct ScePspSRect {
        short int       x;
        short int       y;
        short int       w;
        short int       h;
}

2. If I have this union in C:
typedef union ScePspUnion128 {
/*      SceULong128     qw;*/   /* Missing compiler support. */
/*      SceULong128     uq;*/
/*      SceLong128      q;*/
        SceULong64              ul[2];
        SceLong64               l[2];
        unsigned int    ui[4];
        int                     i[4];
        unsigned short  us[8];
        short int               s[8];
        unsigned char   uc[16];
        char                    c[16];
        float                   f[4];
        ScePspFRect     fr;
        ScePspIRect     ir;
        ScePspFVector4  fv;
        ScePspIVector4  iv;
        ScePspFQuaternion fq;
        ScePspFColor    fc;
        ScePspRGBA8888  rgba8888[4];
        ScePspRGBA4444  rgba4444[8];
        ScePspRGBA5551  rgba5551[8];
        ScePspRGB565    rgb565[8];
} ScePspUnion128 __attribute__((aligned(16)));

Does it convert to this:
union ScePspUnion128 {
/*      SceULong128     qw;*/   /* Missing compiler support. */
/*      SceULong128     uq;*/
/*      SceLong128      q;*/
        align(16)
{
        SceULong64              ul[2];
        SceLong64               l[2];
        uint    ui[4];
        int                     i[4];
        ushort  us[8];
        short int               s[8]; //What type???
        ubyte   uc[16];
        char                    c[16]; //should it be byte or char?
        float                   f[4];
        ScePspFRect     fr;
        ScePspIRect     ir;
        ScePspFVector4  fv;
        ScePspIVector4  iv;
        ScePspFQuaternion fq;
        ScePspFColor    fc;
        ScePspRGBA8888  rgba8888[4];
        ScePspRGBA4444  rgba4444[8];
        ScePspRGBA5551  rgba5551[8];
        ScePspRGB565    rgb565[8];
}
} 
Are those type changes correct? Can I use the same way to align structs defined 
like that?

3.
typedef uint8_t                         u8;
typedef uint16_t                        u16;

typedef uint32_t                        u32;
typedef uint64_t                        u64;

typedef int8_t                          s8;
typedef int16_t                         s16;

typedef int32_t                         s32;
typedef int64_t                         s64;

Would it be okay to be make/alias all of the uintxx_t to 'uint' and all of the 
intxx_t to 'int'?
P.S. If anyone is wondering, this is taken from the homebrew PSP SDK.
Thanks,
Michael P.